According to Arbitron, 50% of adults (over the age of 21) have visited a bar in the last month. They further state that bar patrons are more likely to be early adopters of technology. The important part, I guess, is that 48% of bar patrons make more than $50K a year.
For more information on this, read Bar-based advertising is the Hot-Spot for Affluent Adults & Influential Consumers by HispanicAd.com.