How to eliminate competition from low price competitors

[The Pittsburgh MLS] excluded any type of listing other than the traditional full-service style of real estate broker listing agreement, which is typically associated with a non-discounted commission.

But don't let the FTC catch you doing it:

The FTC's consent order settling the charges bars [the Pittsburgh MLS] from imposing restrictions that discouraged brokers who subscribed to the MLS from offering lower-cost, limited brokerage services to home sellers in the Pittsburgh area.