If Need is highlighted, you can need. That is the way the game is written and the way the game works. All of these other wanna be social rules don't actually exist, except in the minds of people who feel they are being cheated because they wanted something you could legitimately get. It doesn't matter if you need it to equip, sell, spirit bond, or just play with yourself with.

Personnaly, if I don't need it but want to sell it or something like that, I greed. But that is a personal choice and I am not allowed, nor required to make anyone else do that.