If you run 50/50 all winter, I think you will be fine. Yes 100% salt is better. However if you put down 50/50, ice and snow will still melt, and you will have sand to provide extra traction. Most times this method will also require an adition scrape at the lot, then an aditional app of salt/sand. Only if you factor all this into your price, and you are making money, why does it matter.
If your making money with the method your useing, why not go with it? I don't care if you melt snow and ice with, salt and sand, salt, magic salt, CMA (whatever that is), a flame thrower, mag cloride, calcium cloride, giant heater added to the front of your plow, whatever else someone can dream up. If you making money go with it, It doesn't matter what it is. Hey we are all different, and thats what makes this whole snow biz thing fun.
Geoff