I was unaware that scratched glass was a big enough problem for there to be someone specializing in it. As far as add ons go, I think that builders often need janitorial/maid service to 100% clean the house for presentation to the buyer or realtor. I know around me that there are also guys that sub for punch list stuff only. That would make sense for you too, since glass scratches are a punch list item.
IMHO replacement would fit well with scratches that are too deep to repair. You might also consider auto glass, rock dings. I have had this done a few times with satisfactory restults and I'm pretty sure that the guy made a decent bean.
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