I know this is really obvious and basic, but seeing as it is holidays let me say it anyway. Christianity is all about sacrifice. It is about the son of God walking human roads, rather than living in a palace.
But I don't believe that Christianity is about poverty and degradation. Jesus was humble, but not demeaned. He had dignity and I should think a measure of success that demanded respect.
So, where a mega-church (or any church) tries to appeal by providing luxurious surroundings it needs to be careful that it is not denying the need for sacrifice. On the other hand, neglecting church property or not looking to the comfort of staff or congregation also misses the point.
Somewhere there is a balance.