I would point out that if someone is contributing to conversations (and not talking to himself) in all (most) of his posts, the number of accounts he uses to do this really does not matter, nor does the fact he is getting paid for his signature matter.
IMO, it's not trustworthy behavior. Your defense of alts is sort of supporting Lauda's comments about you making this sort of thing a business.
I do not like hidden alts, in general, the same way I wouldn't want to walk into a room of people and have someone come up and introduce themselves as "Dan" and then have a conversation with me, and then I find out when I get back home that this person is also known as Omar, Dave, George, etc. and then I find out he is paid while acting like someone else because of the logo he was wearing. Would I trust that person after that? NO, even if he wasn't getting paid, but this just makes it worse in my mind because it adds greed into the dishonesty.
Greed + dishonesty == two traits shared by all scammers