All three offer rebates. Enough of the conspiracy theory mortgage fraud. These are all legitimate services. If the buyer has done all the legwork and the seller is going to fork over a selling commission, the realator should cut a check to the buyer. If on the other hand a realator has driven you around for a couple of months and identified the perfect property, you would be a real piece of junk to try and cut this person out of their commission or try haggling after the fact about splitting a commission.