Before I was married, A friend and I were bored one weekend and did not have a lot of money to do anything.
We set each other a challenge. To go and spend £20 each on stuff in cheap shops, and to see who could make the most money in two weeks with the items on ebay, with items sold as we had bought them. We both did elaborate decsriptions, took very staged photos.
Normal sort of tat, computer stuff, books, kitchen stuff.
He made £33 PROFIT
I made £49, and this was calculated after sales fees, wrapping were deducted.......
I can think of worse ways to waste your time...