I can think of one, off the top of my head, that an old timer told me years ago before the internet.
A team playing it's 3rd road game in a row doesn't fare well.
But in today's info world, all that is already figured into the line.
You cannot win at this with the advantage the books have unless you have more money than God to move the lines to your favor.
Christ, all the books have the same line anymore. Not to mention, if you beat the shit out of your local, he might not pay you.
I don't believe anybody makes a long term profit at sportsbetting and especially enough to make a living from it. Maybe a small percentage of ONE percent can.
And I don't mean a whole 1%, I mean a small percentage of 1%
You can't convince me so don't try.