It was only recently that I talked with Rich Hunt about people aiming at the apex of a putt. Rich said something about how he felt like a lot of golfers aimed at the apex of the putt. My opinion was something like "Who would be so stupid?"
And when he said they aimed at the apex of the putt, he meant it. He said people would see the "high point" of the putt and they'd literally try to aim it there. Again, "who would be so stupid"? I'd literally never seen it before.
Until I started looking for it. I'd casually ask some golfers where they were aiming. By and large a lot of them would pick a spot about halfway to the hole, say "right here," and correctly state that their ball should roll over that spot. Then they'd line up to it! They'd then have to wickedly PUSH or PULL their putts to get the ball to roll over that spot. Talk about inconsistent...
In case it's not obvious to you, your ball starts breaking immediately. You're better off aiming at the true "high point" of the putt - not the apex, but the "AimPoint" if you want to use the way AimPoint teaches green reading, and putting straight at that. At least it's accurate. You can line up to it, deliver the ball straight to it, and when it starts to go "low" of that point immediately, that's okay.
Two funny stories, both from the same guy... This was a scramble so the pins were put in some REALLY awkward places. Literally about half a percentage away from roll-off type slopes.
On one hole, our twenty foot putt broke - no kidding - eight feet. It'd enter the hole almost 70 degrees from the direction we were putting. The Guy's read? "Foot and half, firm." After someone else putted he adjusted it to "two feet" and pointed at a spot that was four feet left of the hole if measured at the hole. His starting line? Four feet left (at the hole) of the mark he pointed at. His ball rolled just high of that mark and he said "see? Toldja."
On a later hole, we had ten feet on a relatively steep slope. My read, which I announced to the group, was "nine inches, 9 inches past for speed." The Guy says "No WAY it's nine inches. I have it right here." He puts his putter down and the other three members of the group turn to me and smile. Politely (well, somewhat) I say "That's nine inches! Look! It's two cups away and then a little tiny bit." The Guy probably couldn't have put his putter head down nine inches outside the edge of the cup any better if he had a ruler.
Do yourself a favor. Learn to read putts with some sort of AimPoint - whether you take an actual "AimPoint" session or not - and make every putt "straight." If you're one of the people who "putt to the apex," stop right away. You're likely manipulating things from there.