selling a boat

I've got my boat up for sale in the boat trader and my wife gets a call from itrustmotors at this website- http://www.itmotors.com/ They say they will actively work until our boat is sold at the asking price. The price for their service is $189. Has anybody used these people before, and how was their service?

Thanks!!

The boat for sale is located here- http://adcache.boattraderonline.com/6/4/2/90142542.htm