That looks like bumping to me. I personally wouldn't say they're worth much but some people seem to like these short domains, regardless of whether they mean something...
from what i saw about the 4 letters .com domains sold, that i guess you can get up to high $xx each but if you waited for a while,it could be more, try to post them for sale without price " offers" sections & see
cuz sometimes you can just find a reseller or resellers only & the reseller(s) can find the end-user(s) , but we all hope to find the end-user(s) ourselves, it's like products sold directly from a factory & a product from a shop