Bait-and-switch

"Bait-and-switch is a form of fraud...

...First, customers are "baited" by advertising for a product or service at a low price; second, the customers discover that the advertised good is not available and are "switched" to a costlier product.

...The goal of the bait-and-switch is to persuade buyers to purchase the substitute goods as a means of avoiding disappointment over not getting the bait, or as a way to recover sunk costs expended to try to obtain the bait.

It suggests that the seller will not show the original product or service advertised but instead will demonstrate a more expensive product or a similar product with a higher margin.

...Real Estate Brokers and Agents often advertise themselves as buyer agents without disclosing that they may not be able to provide that service if they work for a brokerage that lists homes and represents home sellers."

Bait-and-switch