They're either really desperate, or really stupid, to beg money from poverty-stricken Central Americans.
Hum. Maybe it's "both"
I would posit that a lot of it comes from an incredible sense of entitlement as well. They're god's mouthpiece, so of course these people should be sending money!
I guess if you think about the tale of the widow giving two coins of little value, it makes sense. She gave out of her need - so of course they're going to beg for money from the people with more need to give out of.