Installer Pay

when I started I was making 7.50/hr, worked my way up to $10.25 over about 4 years. I left that store. (this was 8 years ago) I have been working for my current company for 8 years now, where I get paid commission 38%.. I can usually average 500 a day in labor, 10 hour days. we used to work 4 days but now its 5, and for me its usually 6. I sometimes have to pull 70 hour weeks just to keep up with the work load (I worked 15 hours today) I have been installing for about 15 years now (12 years pro).I was MECP, but now I am not certified, only because there is no benefit for me to be. I won't expect a raise of any kind either for certification or for quality of work. I am the second highest paid installer in the company which consists of 10 stores. I really don't see any way to make more than 50k doing what I do.  I am frustrated working at this company because the hacks make the most money and do the least work. I think the logical next step would be to open up my own shop. I hope to be able to make more money and not work ironman shifts. plus I am getting too old and decrepit to keep installing forever. It's really tough on your body.