It's hard to say mefitz. The Hit pin award only got implemented a few months ago, while the holed approach shot stat has been there the whole time. For those of us who were here since the begninng, the ratio is bound to be a bit skewed.
Right now I'm at 215 pins hit and 303 holed approaches. I was at about 100 Holed approaches when the Hit Pin stat came, so the ratio for me is nearly 1 to 1....when I hit the pin it almost always is going in.