A Friend in Need said: How would you know if JWs do charitable (materially) or not?
Uh, because it's right there in the pages of the Watchtower. We had a study article a few years ago on it and it made no bones about the fact that they think banging on people's doors trying to sell magazines was far superior "charity work" to anyone actually trying to feed the hungry. The smug rationale of the Organization is "...we're offering people everlasting life", which to them apparently means that you shouldn't make any attempt to feed someone who's starving NOW. It is, in fact, it's very much frowned upon as I learned first hand when the elders discovered that I was making a big pot of soup each Tuesday and taking it to our local Soup Kitchen. I was questioned as to WHY I would be doing this when "...only God's Kingdom provides a permanent solution to mankinds problems...." They didn't like it when I replied that Jesus certainly never felt that way, and that He DID feed people who were hungry at that time, so why don't we? They had no answer.
It's a shame too, because if the Witnesses spent half as much time actually doing charity work as what they do trying to sell magazines, they'd be doing something worthwhile and wouldn't be viewed as a joke of a religion.