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