I know what it's like. I have 4 accounts and about 14 characters... I have trouble finding time to play them all, I want to have less ships so I can focus my time on a few. But.. I'm just so attached to all my ships I couldn't possibly delete them. Even the ones I don't fly regularly...
You could always not walk your characters, then all the unloved ones will get deleted and you won't have to worry about them any more xD