I will go with accumulated bets, not because of greed but the chance of recovery of losses from the previous. Let's say for instance: Newcastle is having a match against Manchester City and then because of the form of City, you select a straight win X2 with odd of 1.3, if you bet that game with $100 and it win, you will win $130 in return and if the next time you place another bet on Manchester City with another $100 and they lost, you will have nothing and will be left with $30. Your initial $100 is gone and you are left it $30 and to make back the initial, you will probably need to gamble a lot to get back that money before even starting to think of profits.

Now, if you have $100 on 10 odds with 7 games and all won as you predicted, you will win $1k right and you can bet another $100 in your next game, even if you lose you can still have $900 left in your account and with more strategy, you can win more if luck shine on you. The only challenge I see here is that the more you accumulate games, the harder it becomes to win because there is every chance a single game from that accumulated games will make you lose the bets.