New Stream of Income?

I had a conversation with a few friends last night that may turn into a new stream of income. They have items that they want to sell, but not the time to do it. I offered to sell the items for them - either for a flat $10 fee or 25% of the final price, whichever they prefer. The nice think is that there is absolutely no risk for me - they pay for all the listing fees and final fees. They are supposed to bring some items over next week and I'll see how this works out.