I don't bet big amount. Usually, I bet $4/$5 worth of BTC on a lot of matches; sometimes I win and sometimes I loss. But that can't make me any profit.
Should I go for bigger amount of bets on few matches or stay with current strategy (placing many bets of small amounts)?
However if you are looking for a way to make profits and you eventually find it then it is better to bet on many matches than in a few, why is that? Once again it is because of variance, if you bet everything in just a few games there is always the possibility of something happening in those games and you could lose your money because of it despite taking the right decisions, but if you bet a small amount on many games even if there are a few of those games on your bets the amount of money you will lose is small and you have a chance to recover your money with the rest of the games in which you made a bet.