Because if you wanted to advance a cam, say 4 degrees (which to Comp is the de facto number now) you had to use offset keys or bushing if you didn't have a GOOD gear drive or multi key way gears. To make it easier, cam companies started grinding the cams with the advance built it. This made it so guys who didn't have multi key way gears or offset keys or bushings would likely get the cam "straight up" by lining up the dots. All cams should still be degreed in regardless.
That's why I was confused by the cam card. If you have it dot to dot it should be at 107. Why they want it 5 ahead I have no idea. If at dot to dot it's at 110 it's possible you have 3 degrees of tolerance stack up in the system.
Me, I'd leave the thing at 110. With chain stretch it will run closer to 112 though. I'm not a fan of my cam grinder designing a cam with advance built in, or dual pattern cams (most of the time).