The price of the house is just a suggestion, or a guideline. People expect you to offer. Also, realtors have access to listings all over that state in any price range. That is the main way that they get sales other then by referrals. I noticed the one person mentioned the signs. The signs do cost a lot, but the main reason is to get new clients. If they do not get their name out there then they will not make any money. Also, people tend to use the person who's name they see the most of around town.