Redietz going on about middles. lol. Sure they're great but there is so much more to it.
Redietz clearly is not a professional gambler. If so, he would realize that there is a time element. I don't think middles are a strategy pursued by many. If you come across one then sure. Freeroll time! Great.... but that doesn't mean you'll come across them often on. He just doesn't get so much. Especially given the nature of bonus grinding which implies you are not keeping money on many sites. (which greatly enables the possibility of coming across a middle)
Either you enjoy what you are doing or you should strongly consider the time aspect. (hourly) Sitting around looking for middles for weeks to finish out the bonus is not a smart use of your time if you have other outs. In addition having to lock up money all over the place is not so great. Not really a strategy for winners.
You can be a slot vulture and have guaranteed profit on every play but you're going to be wasting a lot of time looking for them and lose out on overall profit. Anyway.. not going to go into analogies. If people can't see Redietz is a fool then I'm not going to be able to fix that.
And lets not get into the fact that he openly spouts gambling fallacies as the rational thing to do. lolz. Poor bastard. Not clueful enough to realize how clueless he is. A bad spot to be in life.....
Redietz, you poor bastard, good luck.
That being said I'm not a professional sports bettor or claim to know much about it. It appears I know enough to spot bullshit though.