I'm not Rick....duh. Nonetheless I can help answer this question with some actual stats in regards to service scheduling. Unfortunately, I cannot pass along some of the most recent stats, in this area, but things haven't changed tons.
A few years ago (pre-Cox acquisition) we toyed with the idea of buying Time Highway and a few other service scheduling products. Time Highway told us the average dealer scheduled 7% of his appointments through the online scheduling tool. For the record: Time Highway had the lowest claim. When I worked at Checkered Flag our BMW store hit well into the 30% territory on Xtime. Our volume stores were consistently in the teens.
So, Ben, in my own experiences I know that it is somewhere as little as 7% of all service customers and as much as 1/3rd. That's pretty damn significant considering the current state of online scheduling tools' user experiences. Imagine how much higher this could be with some innovation