Once you get to know how bookmakers make sure they always make profit, your gambling experience can be phenomenal. Some matches are over priced or over priced ( more odds offered for a winning team).
What things have you noticed with Bookmakers that they do not want punters to know?
In my local bookie, back in 2014, I waged on NBA games with him. I was doing martin gale and was losing pretty bad. So what happen was I'm on my 6th lost and I needed to wage $1,000 for a game. When I informed him about it, he said he would change the odds for this bet. I was shocked with it as it was the first time he did it. I knew a lot of players that gambled with him. So I think they always know who will win.
I guess they don't know who will win, otherwise they just beat on the other sportsbook and stop operating, maybe the amount you bet is too big and they cannot accept it anymore so they change the odds so you'll have a lesser payout in case you win. The thing is, if you are only betting in a big and reputable gambling site that $1,000 would never be big, I have seen people betting like 10 BTC in nitrogensports, so maybe you bet on such site.