I think there are a few different types of these. The "Office Supplies Audit" is the easy and quick one. I do it at the office supply retail store and it's fast.
Then there was the other one. I did one of the more involved types that included way too much for the low fee. Won't be doing that again. It took a ridiculous amount of time with a crazy amount of info needed. I believe they have cleaned it up a bit, but I still won't do it. I stick to the easy in and out ones.
I know you are right. I did one several years ago where you went in and told an associate you needed a printer cartridge for a certain printer and to see if they offered a non-OEM, similar replacement refill or the original manufacturers refill. When I did mine, the employee went as far as to check the prices on the Internet and offer to price match those if they were less.
Now that shop I would do again in a heartbeat. It might have been with a different MSC though I can't remember
The shop with the current MSC asks for "discrete" pictures of all the inks, the book that tells what ink you need for your particular printer and the one I did, photo and other types of same brand paper in another part of the store.