I think rich vs. poor is kind of a silly way to look at this sort of thing. Being poor doesn't make a person charitable, nor does being rich make a person stingy, and so on--it all comes down to the individual concerned. We've learned that lesson with regards to all sorts of things, like race, gender, etc. But Marx' stink persists, so judging and hating people based on their economic situation is still considered kosher in polite society.
That said, and to address some of the conversation here, I know this: If I were running a charity or dependent on one, and I had to choose between a poor man donating five or so percent of his wealth versus a rich man donating two percent... I know what I'd choose. Can't buy much bread with the widow's mite.
