i think that you have a misconception value of twitter account. Twitter account username is not worth anything.
Number of followers, auditscore, activity, followers ratio, spam score.. the fact that you pay attention
I'm hoping @EarnBitcoin is worth the $80 over something like @EarnBitcoin2016.
or @earnbitcoins, @earn_bitcoin or @earnbitcoin_ or... But you always can get nice "display name"
no one searches Twitter on username as a parameter