I don`t know what I think about that. Sure, if you want to sell your account, if you don`t use it, it`s up to you. But there are two things, the first is that it is against the rules I belive, the EULA or what they call it, and the second, as ^ mentioned, you never knoe if you get more time later, or want to play S3 or S2 later, then there can be a good idea to just have your lisence just in case you want to come back
But, if you want, you do that, it`s not like we can stop you, just think over it well before you make a dsessision
You can save some money if you want to play S3 in the future hehe.