There is a tendency towards “The ends justifies the means” theology in churches and it has been that way for a long time. If Jim and Tammie Faye Bakker were cheats and frauds, it is OK because some people got baptized. I also keep meeting Christians that think going to church is an inconvenience.
Mega-churches can be really good things. Many of them are mega because they work. The Village Church in Texas is one example.
We still preach on sin. We just preach on the sins that the other people commit. The sin of global warming. The sin of not supporting increased Welfare. The sin of uber-wealth. The sin of owning a Hummer.