 A shill may also act to discredit opponents or critics of the person or organization in which they have a vested interest through character assassination or other means.In most uses, "shill" refers to someone who purposely gives onlookers, participants or "marks" the impression of an enthusiastic customer independent of the seller, marketer or con artist, for whom they are secretly working.The person or group in league with the shill relies on crowd psychology to encourage other onlookers or audience members to do business with the seller or accept the ideas they are promoting.