This is awesome, Thanks a bunch for all the infoAtoma 140, many knives as long as you don't use it to flatten stones as well.
Some haze along the shoulder won't be a problem as long as edge quality is good.
Many pro and part time cash sharpeners use SiC stones, but it makes a huge difference if you're using them on a bench or with something like a tri-hone setup. Pretty sure David Martin uses a combination of Crystalon, DMT and India stones, primary customers are professional meat cutters I believe, but am not comfortable speaking for him, nor do I know exactly what his cash-work setup consists of.
As with any business, getting customers and minimizing travel and handling time is huge.