~snip~
So if you only choose single bets then you will lose less money than with multi bets, and regardless of whether you play for fun or profits, choosing the bet with the smaller house edge and losing less money is always the best option.
^ It seems you are right, a single bet seems more profitable when it comes long term betting than the multi-bet.
Multi bet in terms of OP or known as a double bet is good when you are lucky enough if those bets are all luckily get a win but both sides are all failures, that is the time you will have a big loss. I like single bet, it seems you are having fun and I think in this way you are not looking greedy, it seems you put your bet for fun only not chasing the money.