CrowdPicSell is a crowd-sourced photography marketplace.
For spectator photographers, it enables them to upload, publish, and sell their photos online.
For sporting participants, it enables them to then search for, find, and purchase those photos at great prices.
If you go to an event like a marathon, triathlon, or soccer game, there are many spectators sporting nice cameras taking pictures of "their" athlete. CrowdPicSell gives them a way to take pictures of participants they (probably) don't know, and then offer them for sale on CrowdPicSell.