I love how this thread didn't even have to devolve into a discussion of making money sharpening chains. Us poor novice schmucks that just want to pay someone to get a job we don't want to do done have a hard time getting a word in edgewise!
It's a free forum. If you do not like the responses, ask for your money back.
The key point is that 'the Franzen' does not sharpen the chain, anymore than a file, Dremel tool, Oregon grinder, etc. It is the operator who sharpens the chains, using one of those types of tools. They might do a good job; they might do a poor job.
Money becomes an issue because, in the experiences of the participants whom you asked, some shops focus on the number of chains they do, and how cheaply they can do them, rather than on doing them 'right'. Your initial post referenced the cost of sharpening, so folks were trying to give you some perspective on those costs.
Looks like I can get 7 20" chains done for the $50 not a bad deal at $7 each. . .
These guys look ok too: . . . .Bit more at $7.90 per chain. . .
. . . my other option involves either paying a bridge toll and driving to the nearest shop and paying the ridiculous rate of $10/ chain + tax for sharpening.
You asked for a recommendation, and you got some.
Lots of other good information, and opinions, in these threads if you use the 'Search' function.
Philbert