I would agree; I would say that even on an "experiential" route a policy of, "Your first drink with dinner is on us!" is more than generous enough. If you leave it wide open, like airline first class, the Booze People will hammer you dry...and those who are not booze people will feel cheated.My main reason for having a per trip limit on drinks is 1) drinks have a good mark up and 2) I wouldn't want to deal with the politics of giving away too many freebies to tourists. I'd rather burn political capital defending why I'm asking for a $300 billion dollar capital infusion and changing how routes are classified, since that would be the thing I would be gunning for.
As for other things offered in a Tavern, I would offer a daily food and drink tasting and/or brunch service on a daily basis. So I'm not really sure if having more than snacks would really be worthwhile. I do like the idea of a dessert service though.
I also think a "what would you do for "corridor" service" post would also be a fun follow up to this one.