Mammon of unrighteousness. Mammon is equivalent to money, or wealth; called the mammon of unrighteousness, not because it is acquired unrighteously, but because most use it unrighteously, treating it as their own, when they are only stewards. What is the use the Lord charges us to put it to? It is: Make to yourselves friends by means of the mammon of unrighteousness (riches), that when it shall fail (when you can use it no longer), they shall receive you into eternal tabernacles (heaven). It is strange that there is any difficulty over this passage, as translated clearly in the Revised Version. The only friends who can receive us into heaven are the Father and the Son. These are, then, the friends we must secure. During life our means must be so used as to please God and to lay up eternal treasure. If we use it as a trust of the Lord we will secure such a friend. Instead of hoarding we must make heavenly friends.

The New World Translation renders it this way: “Make friends for yourselves by means of the unrighteous riches, so that, when such fail, they may receive you into the everlasting dwelling places. The person faithful in what is least is faithful also in much, and the person unrighteous in what is least is unrighteous also in much. Therefore, if you have not proved yourselves faithful in connection with the unrighteous riches, who will entrust you with what is true?”—Luke 16:9-11. There certainly is nothing unrighteous about spiritual riches. But this cannot be said about material wealth. Both the possession of and the desire for material riches can lead persons to commit unrighteous acts. Wealthy persons may become oppressive, harsh and callous. Instead of responding compassionately toward persons in need, they may take unfair advantage of them. “When saying “make friends,” Jesus Christ was not speaking about gaining friends among humans. He added that the friends to whom he was referring would receive one into the “everlasting dwelling places” when the “unrighteous riches” failed. Riches fail all humans at the time of death, and dying humans cannot receive anyone into “everlasting dwelling places.” But the eternal and immortal God Jehovah and his immortal Son, the Lord Jesus Christ, can receive others into “everlasting dwelling places.” Jesus Christ assured his disciples of this, saying: “In the house of my Father there are many abodes. Otherwise, I would have told you, because I am going my way to prepare a place for you.”—John 14:2. The only ones who will gain access to the “everlasting dwelling places” of Jehovah God and his Son are those who measure up to his requirements. Said Jesus: “Not everyone saying to me, ‘Lord, Lord,’ will enter into the kingdom of the heavens, but the one doing the will of my Father who is in the heavens will.” (Matt. 7:21) God’s will for humans includes their leading honest, upright lives. In his Word we are told that “greedy persons” and “extortioners” will not inherit his kingdom. (1 Cor. 6:9, 10) We also read: “Let the stealer steal no more, but rather let him do hard work, doing with his hands what is good work, that he may have something to distribute to someone in need.” (Eph. 4:28) Hence no one who continues acquiring riches through dishonest or fraudulent means will become a friend of Jehovah God and of his Son and be received into the “everlasting dwelling places.” Honesty is required not only of those who will rule with Christ in the heavenly kingdom but also of those who will be its loyal subjects. Such loyal subjects are depicted in Scripture as being arrayed in “white robes,” that is, as having a clean, acceptable appearance before Jehovah God. It being their privilege to render sacred service to God in his temple, they must meet the requirements for being a guest in that temple. (Rev. 7:13-15) Answering the question as to who would be a guest in Jehovah’s sanctuary, the inspired psalmist declared: “He who is walking faultlessly and practicing righteousness and speaking the truth in his heart. . . . And a bribe against the innocent one he has not taken.”—Ps. 15:1-5. The point emphasized by Jesus at Luke 16:9 is thus seen to be the need for one to use material riches properly, wisely. One desiring divine approval should use honestly acquired material things, not for selfish purposes, but, rather, for the advancement of pure worship and in rendering aid to needy fellow humans”. Source: Scriptures cited and the January 15th, 1973 Watchtower. Page 31

Luke 16:9 is a "The Parable of the Shrewd Manager." As such, as any parable, interpretation is dependant on the revelation of the Holy Spirit to an inquirer soul. The workings and the purpose of the parables are explained in the Chapter Mark 4:11 and Luke 8:10. The urging to exercise inquiries in obtaining an answer is found in Matthew 7:7-8. To ask on your behalf would not work even if I would ask Jesus what he meant, and then translate this to you; you would reject it. It will ONLY work if you hear it from Him, the process is called revelation, one of two Spiritual communication channels open wide to those that ‘believe’, Revelation and Convictions.

life is not about money.

My understanding of the parable is that Jesus is telling his followers to make their money really count. i.e use money for the Kingdom of God. The dishonest manager knew a time was coming where there would be a change (i.e. he would be jobless) so he made the money (unfortunately not his own!) count and spent it with the new time ahead in his mind. Similarly Jesus I think is telling his followers to use our worldly possessions for the age to come and for the Kingdom of God. i.e "use worldly wealth to gain friends for yourselves, so that when it is gone, you will be welcomed into eternal dwellings" e.g simple example-a believer donates money so that someone can buy a Bible, read it and trust in Jesus. Judgment day comes and the beliver upon entering God's Kingdom meets that someone there with them.