Low odds means if you bet 10 BTC to win 2 BTC at directbet if you bet the same 10 BTC at Nitrogen or Sportsbet you would win 3 BTC. Winning gamblers would never bet at directbet because of low odds.
Funny that you are making it sounds like there are a whole lot of different between odds in Directbet and nitrogen. In fact there is no such big spread for their odds. If you bet 10 btc and win 2 btc in directbet , you could win 2.10 - 2.20 btc in nitrogen Not much but still worth it however he is probably here because he use ethereum to bet
Not commenting about the odds on various sites and not talking about DB in particular, but I have seen such difference in odds in the past. Its not like 1.2 and 1.3, but changes by that much at say 1.8 and 1.9 on different sites.