Blasting here at my shop runs $150pr hr, with a $150 setup fee. We use crushed glass, medium grit it feels pretty close to sugar sand to the touch, doesnt cut skin like youd think when you hear glass. Its "safer and healthier" than silica sand and much easier to clean for paint than soda. Ours is by far not dust free, we do what we can to keep the dust down, but its done outside so theres not much hope. As far as business model, we dont have near enough to pay the bills, but the equipment is payed for and we havent had to outsource that part for years, it used to cost anywhere from $12-1800 to have a car stripped for reference. Our setup is mobile and we have done jobs offsite, with a haul fee and extra setup time added. I would imagine the startup for something like that would be super expensive, our Kaeser compressor that the rig runs off of cost $15k and up for used, then you gotta get the hopper and the rest of the setup.