Famous last words right there.
And, for those with the tip jars, you have to be careful about that. They can backfire in a couple ways.
First, even if they seem okay right now, they will become unseemly at some point in your life. For example, I did not mind it so much in college. Nobody had any money, so a tip jar would come up from time to time. Even then, though, it typically was an open party that did not require an invitation to attend. I never minded a tip jar when I went to some party hosted by someone I did not know (e.g., There's a kegger at [random address]! We're going!)
Second, the idea of hospitality and the message of a tip jar are incosistent. Didn't you invite these people to your home in the spirit of hospitality and to enjoy the pleasure of their company? Or did you invite them over to show off your brewing efforts, maybe get some "attaboy"s and to subsidize your brewing habit? Are you hosting a party or running an enterprise? A tip jar suggests the latter in each case.
Third, as I observed at those parties with tip jars, dropping a buck in the tip jar changes many guests' attitudes. As far as they are concerned, they are now customers, and they are going to live it up. You might wind up with eight bucks, three empty cornies, and a bunch of drunk customers. If you blow a keg right after someone drops in a tip, will you offer a refund? Do you really want to put one or more of your guests in a position where they must decide whether to ask?
There are too many other ways to control consumption, rather than raising the price. Still, I wouldn't mind what Funkenjaeger has to say on this matter.
TL