People spend time, gas, miles on the car looking and if the price is fair why not a little. A little to help keep you on the road in the hunt and helping others. I know that it is way easier for me to give someone something to help me get what I am looking for rather than spend the time and expense of hunting myself. I think of it less as a 'finders fee' and more of a thank you.

The other side is that a picker gets it and marks it up 50% or it goes on ebay for stupid money.