The price of soda everywhere is ridiculous. Most restaurants charge $2, but that usually comes with free refills. $3 without free refills is insane. Just stick to the free water.
I usually have one or two beers when I attend a concert. $6 + $1 tip for a Newcastle Brown Ale or Sierra Nevada is a lot, but it's only about a $1 more than Black Cat for the same beers. Yuengling seems overpriced though, I agree.
I'm for anything that results in less alcohol being imbibed at shows. The concert attendees who are plastered are usually the ones that are distracting me from the music. If fewer people are getting drunk at shows and stumbling around and getting obnoxious instead of listening to the music, I'll happily pay an extra dollar for my beer.