I understand where you are coming from, but the fact that you are doing only 10% medical means that you are doing 90% optical. (please correct me if I'm wrong)
WHile you can certainly make money doing this (and for the 100th time, I never said you couldnt make good money in optometry) it is this type of scenario that only reinforces the publics image of optometrists as eyeglasses merchants first and foremost and "doctors" a distant second. As long as this trend continues to occur, it is going to put optometry at the mercy of large corporations because the fact remains that large commercial opticals can provide high quality optical services to 95% of their customers faster, cheaper, and more efficiently than 95% of private practice ODs out there.
ODs are the only health care delivery professional that makes the majority of its income from material sales. As long as ODs continue to make the bulk of their revenue from material sales, I predict a fate for optometry just like pharmacy. ODs will always make very good money, and always above the national average. But they will end up working retail hours in retail locations, just like pharmacy. I see no trend on the horizon that is going to reverse this course soon enough.
If you are doing 10% medical and 90% optical, you are essentially running an eyeglass store. There is absolutely nothing wrong with that. But you don't need 8-9 years of very expensive post secondary education to run an eyeglass store. You might as well just go to community college right out of high school, get your opticians certification and open your eyeglass store.