It kind of was. Looking back over my earliest notes, the Wailer's Guild was originally going to be the Mummer's Guild - a troupe of Dustmen actors who spread their philosphy through parable-like plays (tales like Orpheus and the Underworld, etc). They made extensive use of the wine to deliver "the perfect performance" since being Numb (in the Faction ability sense of the word) is hell for method actors.
Whenever I get this adventure finished, I'll hopefully turn all these extra rules and stuff into articles. In the meantime, just go with whatever you like and let me know if you come up with a better explanation!
And here I thought 'mummerwine' was a reference to the mummer troupes of medieval england... http://en.wikipedia.org/wiki/Mummers_Play