That goes against the basic premise of account security. You'd never see a bank website give you a "do not ask again" option on an expired password prompt.
It is the replacement for Free Market stores after all, which had transparency in who you were transacting with.
You seem to be under the impression that bots didn't make use of those as well. Simple enough matter to transfer things to a more "legit-sounding" character name and then sell them like that. I'll give you, though, that it's become far more blatant with the auction house.