DJ is correct alot of the non triers – No hopers are alot bigger but you also get the odd market leader who is a fair bit bigger because people are willing to take him on. Do u understand the concept of Betfair Joe as in Exchanges punter vs punter?
The odds are bigger on Betfair because the middle man (Betfair) operates on a small profit margin. The bookmakers cannot operate with such a small margin so they do everything they can to manipulate the odds in their favour.