While selling your beer is the path to a holiday at the crown's expense. Selling your recipe isn't. I just missed out on trying a seasonal Alley Kat (canada) Dopplebock which had been brewed to a BC home brewers recipe. Gerard did this as part of a comp at Paddy's a year or so ago. Maybe some of our comps could offer this oportunity in the future with some royalties going back to the brewer.
Alley Kat didn't buy the recipe. Kind of a long story, but here goes.
The homebrew club in Regina, Saskatchewan is hosted by a brewpub called the Bushwakker. For as long as I can remember, the owner of the pub has agreed to brew one batch of their competition's best in show beer. Part of this prize is that the best in show homebrewer gets to help brew the beer.
Our club, the Edmonton Homebrewers Guild, decided to ask Neil (owner of Alley Kat) if he'd be willing to offer something similar for our competition. Bear in mind that sometimes the best in show beer may not be something that you could sell. So we asked what seasonal specialty he was planning, and he said it was a doppelbock. We asked if he'd be gracious enough to consider using what he thought was the winning doppelbock as the basis for this particular beer, and he agreed. Here's the fine print: He could reject all entries if he felt that none were good enough, and the doppelbock he chose did not necessarily have to be the best doppelbock as chosen by the judges. He also had ultimate say over the actual recipe. The winner also got to help brew the batch at Alley Kat (and also got his picture on the label). Neil actually brewed two batches of this beer, and apparently sales have been good. We're hoping that he'd be willing to try this again next year, but we haven't asked him yet.
My advice to you would be to simply get a brewery/brewpub interested in this idea, but not actually paying the winning brewer for the recipe and/or royalties. All homebrewers I know would give their left arm to get a commercial establishment to brew their recipe, so I don't think that monetary compensation is a big part of the equation. From the brewery's point of view, they're risking a lot by agreeing to brew something that may not be part of their regular offering. It's our hobby, it's their living.