Personally I bought couple of domains from several owners that similar names like me.
Eg: I owned Domain.nTld and I bought DomainnTld.com from the owner just to have the complete package.
Since .wtf allows singe digit and number domains, if I were the owner of 1.wtf and if I planned on using it, I would pay you around $500. That's just me. Personally I think you should develop this domain into a website or meme blog.. Kinda like 9gag. Best of luck!