Confused about christianity...?

i recently read an article about evangelicals going to Africa and successfully converting 16 percent of the population in the past few years...these preaching leaders live in multi million dollar mansions and show up in white suits claiming to know Jesus and making the poor Africans pay to be cured and saved from things as aweful as AIDS...how can a servant of God that is this wealthy take money from poor people and then claim to cure them of illnessess that are incurable?! this is wrong on soooo many levels, but someone must think this is right, so, is there anyone out there that can defend this act?