Maybe, because you can be less biased and thus more rational in your attitudes?
I'm not involved in this kind of thing (I mean sports betting) but I think I can draw a valid analogy with trading (well, it may be somewhat loose but still better than nothing). In trading, you can fare better than the rest of the pack not because you know something what others don't know but simply because you make fewer mistakes by being less emotional and taking a more balanced approach to what you are doing. I suppose it works with sports betting as well (as with anything else in life, for that matter)
Maybe this approach can work in trading, but in gambling if you think that your past wins were due to your being less emotional and more balanced than others, it's an illusion, and a very dangerous one, if you ask me, because believing in it you can lose a lot of money eventually
Sorry to interrupt you halfway, but it is not about gambling (in the strict sense of the word)
Indeed, with gambling it doesn't matter how less emotional or more balanced your attitude is as it doesn't in the least affect the odds. That goes without saying. But we are talking here about sports betting and it is a completely different animal than dice or any other similar form of gambling in terms of luck as well as odds
And as you said yourself, it may in fact mean things like you being a team doctor, a coach or a relative of a player (let alone being that player herself), but even if you are not, it is still not gambling as there are a plethora of factors at work here other than pure luck, the ones you could consider and account for, thus changing the odds in your favor