Had a look at the odds on offer at the moment, then got distracted by the margins for the outright markets
Nitrogensports = ~3%
Cloudbet = ~5%
Sportsbet.io = ~8%
Why are some much bigger than the others?
Youd have to ask them buddy but its totally up to them what odds they decide to give. Maybe the odds are influenced by bets that they have received (are receiving) on the outright result.