How many poor people could Kenneth Copeland have helped instead of buying a mansion and private jet?

As the New Testament includes: "It is easier for a camel to get through the eye of a needle, than for a rich person to get into Heaven.".  

I didn't give to him so it isn't my worry.

I don't really have an opinion on Copeland or his jet, but your complaint echoes the words of Judas.

John 12:4-6

But one of His disciples, Judas Iscariot, Simon’s son, who would betray Him, said, 5 “Why was this fragrant oil not sold for three hundred denarii and given to the poor?” 6 This he said, not that he cared for the poor, but because he was a thief, and the money box; and he used to take what was put in it."

Self-righteousness is an ugly trait in a Christian.

What Copeland does with his wealth is between him and God. If he has mismanaged what God has given him, he will have to give an account to God - just like the rest of us.

A person can be more generous and less judgmental by reciting the rosary every day with care.