What is a capitalist/libertarian defense of millionarie preachers?

mega-church pastors/celebrity rich preachers;Whats a pro-capitalism defend of them existing and living in luxury?

Im not really a pro-capitalist,but i AM a christian,so Id appreciate a level-headed approach about the legitimacy of ,for example,a pastor who rides a rolls royce.

does the lack of violation of the NAP make it legitimate?Is tithing a free-will use of one’s own money?can preaching be considered a service?