at the risk of quibbling with the dictionary, I've always had a slightly different understanding of the term
at a 3 card monte game, the 'winner' with the handful of cash who is a partner of the dealer is a shill
A shill is an associate of a person selling goods or services or a political group, who pretends no association to the seller/group and assumes the air of an enthusiastic customer. The intention of the shill is, using crowd psychology, to encourage others unaware of the set-up to purchase said goods or services or support the political group's ideological claims. Shills are often employed by confidence artists and governments.
Certainly, I think that is what Chuckles means when he calls me a shill