What do you think of this? At my wedding I noticed the (horrible) bartender (who later asked for the extra beer as payment--hello, we are paying you!) had commandeered one of my centerpiece vases to use as a tip jar. Forget that they couldn't even find said vases until about an hour before the reception started.
Are tip jars the normal when the bride/groom provide the alcohol and pay for the bartender? I think a lot of my guests felt like they had to tip every time they got a drink, and I didn't really want them to feel like they had to pay--we did a hosted bar for a reason!