Oh, he knows exactly what he's doing. He's selling to foot fetish lovers, shoe fetishes, pantie (leotards) and sissies. If you see the names of the buyers, they are male names or female names possibly sissies, and possibly even pedo foot lovers, etc. I've seen ejaculation shoe vids listed on xhamster and xtube to know it's a popular fetish. They think they are slick as they are officially following the rules of ebay but we know what they are doing.
It's probably someone who works at, or at least pretends to hold fundraisers at ballet schools. He's probably going to each school, pitching his line, and saying that donating a pair of used ballet slippers will go to children in poor countries who want to dance or something- then selling the lot on ebay. I sold a few used shoes of mine to God knows who back in my pantie selling days and they ate em'up so I know this is for pure profit. I actually used to dance for years up until I was 16. I then realized I had flat feet and they were really a problem as I couldn't wear the pointe shoes but I did wear out a lot of flats.
If you google donate costumes or ballet shoes quite a few "fundraisers" will come up. And you can even create your own which is probably what they are doing.
http://childrensdancefoundation.thegivingeffect.com/