Not so much "what's in it for me?" as "are you asking for help, or a freebie?". I will often volunteer to help people do things, because I see they need it, and I can pitch in. However, when someone asks for "help", nine times out of ten, they're asking me to give them something (artwork, products, lessons) for free, because they don't want to pay for it. I don't give away the things that earn my living, no matter who is asking for "help".