Hi skbruce,
#2 and #4 fits this "person"...
shill"‚
-noun 1. a person who poses as a customer in order to decoy others into participating, as at a gambling house, auction, confidence game, etc.
2. a person who publicizes or praises something or someone for reasons of self-interest, personal profit, or friendship or loyalty.
-verb (used without object) 3. to work as a shill: He shills for a large casino.
-verb (used with object) 4. to advertise or promote (a product) as or in the manner of a huckster; hustle: He was hired to shill a new TV show.
Credit should be given to
www.dictionary.com, from where this was lifted....
Best,
Bill