Sports betting is really more on your knowledge of the particular sport. Better place your bets to those matches that you feel you have high chance of winning and aim for much higher profit. But maybe, the OP is only conservative in his calculations. We really don't know how far is his knowledge to the sports he is betting with.
I agree with this statement. This happens to those who just go with the flow and ride the bandwagon. If you dont play basketball and just picks on who is popular, definitely you will lose, its not a popularity game. Also, if you place a bet on a team that is currently on top of the list but they sidelined their top player because of an injury, more likely that team will lose. Think first before placing a bet.