Exactly. They got rich off of the business of the church and tax free I might add. How would you like to be rich enough to live in a literal mansion, private jets, numerous cars and not have to pay income tax? Sweet deal.
They pay income tax, as does every citizen with an income above a certain level.
The 501c(3) Religious tax exemption deals with the Church Corporation assets, not any of it's paid staff.
That's not to say that the Osteens don't have a bunch of accountants arranging for them to write off a large part of their income, but Mega-Church ministers are hardly unique in that behaviour.