Some of you already know this, but I found this studio a while ago called Palace of Points. It's actually very methodical. I signed up last night! You can make your own shop and sell to other users through an intricate, balanced point system. I would love to visit your shop if you have one, and I just made my own if you'd like to take a look :D
My apologies if you did not want to be invited, but I invited all of my followers so that they could see my shop, share their shops, and if they haven't joined PoP, make a shop!
Also, go check out @lightningstriike's (my first customer's) shop!