I agree that this one sounds like he may be fishing for that homebrewer that has a really good recipe or recipe idea. then seeing as how they retain the rights to it,it's his & not yours. He said he didn't know much about homebrewing. So instead of trying to come up with his own good beers,like others have done,he wants to cut straight to the chase. Dumping experimental batches can get expensive in a hurry.
I don't know........ Is there actually an "undiscovered" recipe in existence? I suppose - MAYBE - some kind of real specialty type brew with odd ingredients - but for an actual beer style?
Recipe formation seems like one of the least significant aspects of brewing to me - there are literally thousands of GREAT recipes available for little to nothing - Go buy Brewing Classic Styles, buy the annual zymurgy issue that posts all the NHC winner recipes, Google clone recipes that the brewers themselves contribute to (pliny). I mean, honestly, I can't think of an easier aspect in all of homebrewing than getting a good recipe. If you have brewed 5 batches of beer in your life, and can't find a "good recipe" you are are one (or all) of the following:
A.) Living somewhere in the absence of all forms of technology
B.) Not trying or looking very hard
C.) Not very smart.
You would have to know tremendously little about brewing in order to need random homebrewers to come up with your recipes. At that point - I would question if that person was even capable of recognizing a good beer if they had one.
Sanitation and Process make great beer - recipes...... well.....they are a dime a dozen imho.
I can see this whole thing as a nice little side business/niche though if you were in a big enough market - Pull in an extra couple thousand dollars a month, generate interest in your brewery/brewpub, get people to pay you so that they can then go tell 20 of their friends - "Hey, we all have to go to this place so you can try the beer I helped brew" (and pay for it all over again). Honestly, people pay money all the time for dumber things than spending a day in a professional brewery helping to brew a batch of beer. Could see people giving it to dad for X-mas, anniversary, father's day, etc. If no one bites - you are not really out any money......