I'm a bit skeptical of this idea. It sounds good on paper, but by the time you collect data (over a year or two), put it into the AC update and publish cycle, and distribute it, there's a fair chance the information would be obsolete.
To firm up my objection, consider a motel. It's cheap, say $50 ($, perhaps, in some rating system). In three years, it's increased its rates to $70 ($$). Unless they buy new mattresses, repaint and recarpet the rooms, and now it's $99 ($$$). Similarly for an eatery; hamburger, fries, and a coke was $5 two years ago, now it's $7.50. $ just turned into $$; unless you want to buy the seafood platter, which is now $25 ($$$). How do you propose to rate that restaurant?
Look at the updates to the maps. We hoped to get water and food at one grocery in Kentucky that was on the addenda -- too new to be on the map. It had closed by the time we got there. And now you're asking for more time and money to be applied to collect, collate, and publish price and subjective quality data on those ephemeral businesses? I don't see this as being a wise use of available Adventure Cycling resources.