@foone There is a website called NameMC.com that has brewed a very double-edged sword kind of culture that has a lot of positives in preserving history of MC accounts/usernames but also has manifested in account selling and stuff like that
There's a chance that if you claim your profile (log in to a MC server with the account and click the link it gives you in chat) that people may see you as an active user and may discourage them from trying to buy your account due to you "using" the account
Or not... a 5-letter username with no numbers or underscores AND with a Minecon cape (2011 no less) is quite a novelty