I have never known any JW to be df'd for having a great deal of money. I know too many elders and their wives that would be out the door if that were the case. There are many wealthy JWs that do not give away their wealth and go pioneering either.
Things like gambling, fraud, etc., are what the WTS sees as df'ing offenses based on the basic concept of "greed."
Here are some comments on greed and related offenses the WTS lists as df'ing sins.
*** w84 1/15 p. 28 Our "Kingdom Unity" Convention—Why ‘the Best Yet!’ ***
This talk, entitled "Beware of Greediness in a Materialistic World," spelled out the dangers of greed and showed that some individuals have been disfellowshipped for dishonesty that has brought financial harm to others.
*** w98 9/15 p. 25 Negotiating a Reasonable Bride-Price ***
A Christian who greedily and unrepentantly extorts a high bride-price may even be disfellowshipped from the congregation.
*** w01 6/15 p. 6 How Can You Keep a Balanced View of Money? ***
How may covetousness, greed, or "love of money" amount to idolatry? Does this mean that it is wrong to want a bigger house, a newer car, a more profitable job? No, none of these things are evil in themselves. The question is: What is the heart attitude that makes one want any of these things, and are they really necessary?
Our being greedy also indicates that we do not trust that God will follow through on his promise to supply what we need. (Matthew 6:33) Greed, then, amounts to a turning away from God. In this sense too, it is "idolatry."
*** w89 7/15 p. 30 Questions From Readers ***
While some claim that buying a lottery ticket is simple, low-cost entertainment, there is no denying the greed factor. People buy lottery tickets hoping to win a lot of money. This certainly runs in the face of divine counsel against greediness, which can be such a serious vice that it can prevent a person from ‘inheriting God’s kingdom.’ Hence, if a Christian manifested persistent greed by gambling, he could be excluded from the congregation. (1 Corinthians 5:11; 6:10) The Bible says: "An inheritance is being got by greed at first, but its own future will not be blessed." (Proverbs 20:21) If a Christian felt any impulse to ‘take a chance’ in a lottery, he should think seriously about the greed on which the lottery is based. Ephesians 5:3 says that ‘greediness should not even be mentioned among us,’ much less given in to by a Christian.