How greedy are people? I regularly donate expensive flippin' items. Why? Because it's NICE to think that some poor little newbie who's still too low level on zOMG to farm might get a few thousand gold here or there, and it just might make their day. If it's under 5,000g what's the harm in donating? Go through your inventories--you KNOW there's something there you haven't used in forever. No, I'm not saying you should trash the very first little newbie outfit you ever had (I still have my dorky lil' starter items smile) but at the very least, consider that there are people who use Dumpster Dive because they're still playing Jigsaw for money.
Sorry, that got a little more on-the-soapbox-and-the-rag-at-the-same-time-y than I intended, but I've played Dumpster Dive lately and the only donors I've seen are the admins.
It's a fine line between wanting to donate to newer users and not wanting to see expensive/rare/valuable items get lost in an account that ends up becoming inactive within a month. Or, for fear of sounding too "bootstraps-y", to give a false sense that one *deserves* to get high-priced donations.
For me, I'd rather donate my time and energy than an item or gold. I'll always be willing to help a newer user level up in zOMG to the point where they can earn gold on their own, or even go through runs with them to earn the gold too. I'm happy to chat with anyone who quotes me in hangout threads I frequent, if they're looking for a way to pass the time and earn some gold. And, if someone I've interacted with mentions that they're questing for something or feeling a little poor, I will certainly send them a gift or a trade.
I'll admit, the only things I typically throw in dumpster dive are loot/recipes I get on zOMG, but maybe I'll start tossing in a few more slightly rarer items.
I usually just give gifts to my closest friends.
Not because I'm a greedy son-of-a-gun mind you, but just because I know them personally. So if I see a reference item on the MP that I think they'll get a kick out of or something that makes me think of them, I might get it for them. I don't really tend to get gifts for people I don't know, because, well, I don't know them. I don't know what they would like, what they would have a use for, or if they even want a gift.
I would donate a bit more if I ran into more honest users. One too many times Ive seen users purposely dress "poorer" in an effort to sucker others for their gold and items. I dont want to give anything to a liar.
I don't usually donate unless they are my friends. It is very very rare that I will donate to anyone else and if I do I go into forums and look for threads. I don't like it when people ask me to donate to them.