That's a bunch of BS, just like OP's proposal.  There are plenty of honorable members of bitcointalk who are in sig campaigns and don't abuse the privilege. 

Mostly it's the members who've come to the forum specifically to earn money through bounties and/or sig campaigns that end up being the corrupted ones (though there have been exceptions to that, of course). 

And as most members are wearing paid signatures, I'm not sure how you'd put together a DT list that wouldn't be laughable on its face.