Hear, hear.
It would be nice if there were some way to e.g. send somebody a 6-pack of beer for doing what amounts to a favor. This sort of micro-barter-thank-you system is the way a lot of things work in the meatworld. It would feel awkward giving someone cash for what amounts to a small favor, just as it may seem awkward donating some nominal sum via a donate button-- how much is appropriate? $5? $10? What is someone's time actually worth? A small material gift on the other hand connotes respect. There doesn't seem to be a good internet analog yet. Maybe there's a business model here...