Special "the incessant shill" Ed. 
In retail, shills assume the air of enthusiastic customers. This is done particularly when goods of usually negotiable prices—like automobiles—are to be sold; otherwise, it is not very profitable. This type of shilling is probably legal, but rarely used because of the damage it threatens to a retailer's reputation.
A more disturbing case is where a vacant shop is taken over for a very short period (say, a few days, or a week) solely to sell shoddy goods. The seller asks the audience who will buy the offered good-quality item, quoting a low price. The shill immediately "buys" it and triumphantly displays the item to genuine customers as he departs. The seller declares there are many more similar items and that they are fully guaranteed and returnable. In fact, subsequent sales to genuine customers are of faulty or very poor quality goods for inflated prices. Customers that later attempt to return the goods for refund will sometimes be intimidated and deterred by the seller's bodyguards, or be told to return on a later date (by which time the shop is no longer in business). This is usually illegal.
Special "Shameless Self Promoter? Yes. Shill? No." Ed
