Wants positive reviews for unknown reason, in my opinion.
promoting a product in your signature is an endorsement of that product
TV commercials are not endorsed by TV companies and they are advertising various products, but:
and your reputation is influenced by the legitimacy of the campaign. Members should realise this, and take responsibility for their signatures, rather than just prostituting themselves.
...it might negatively reflect on their reputation. I am pretty sure most people here can't even explain what they are advertising (based on PM's I have received).