Every time this comes up, I find most of the complaints so weird. The price of stuff goes up with time, but even so, if you really want to go to a Brewers game, it's not expensive relative to just about any other ticketed event at a professional level. It's cheaper than any other sport, Disney on Ice, a show at the Pabst.
If it is not a marquee game, I would never buy direct from the Brewers anyway if there is not some promotion (which they do a LOT of) . With minimal effort you can still attend some of these games for $10-15. Then there is the fact you can bring in food, but we get food price complaints (the food in the stadium is pretty damn bad anyway and continues to be a major ball-drop from the team IMO) and we still have complaints about paying for parking when you can very easily park for free and walk 15-20 minutes in, for a summer sport where the weather is usually nice, or take one of the bar shuttles for the price of one Miller Lite. I think the last time I went was last year around Father's Day where they had a 4-pack for $64 that included a soda and a hot dog, and it was a Saturday or Sunday. You're not getting that with any other pro team.
All that said, I stopped going. I dropped my SSH and I never go unless invited for some group thing going on there, but it was more circumstantial. Just too many kids activities, and the driving always sucks. I only really had them for the playoff priority and with the playoffs as watered down as they are, that's not worth it either.