Well if your considered an adult (don't know your age) then I shouldn't see why they don't pay you. If I were you I'd ask them again, because your giving your time to help them. It doesn't have to be heavy pay or anything, but at least just a little bit for your hard work. I think thats a little humerous though, I got payed $10 an hour working on my neighbors garden (made $65, sorry ;P)