"Try before you buy" web app?
Problem: Not few times I've been in a position where I want to try/see something in person before I commit into buying it, especially if it's expensive. I would pay a small fee to try the product. Solution: A web platform where product owners can list products they own and make some money by meeting with buyers and letting them see/try the product in person. Buyers pay owners a small fee to try their products and make a safe buying decision.