I have a couple of points on this topic.
1. I do not think raising the cost of season passes will help it that much. Its just the crowd this kind of park appeals to. It has become more of a "Thrill Park" than a family oriented place.
2. Another thing you have to realize is a lot of the undesired crowds you see are from summer camps. most of these kids get a season pass from the camp anyway, so the price change wouldn't rule out these kids either.
3. To be completely honest, and I don't want to be mean, the security at six flags could not really protect against fighting and line cutting. I have seen instances where security guards are thrown to the ground by park guests who broke the rules.
4. Also if six flags wanted to stop a large amount of line cutting, they need to remap their ques. There are plenty of spots, even as a non line cutter, that i have noticed, which would make it super easy to cut lines. probably the worst one in my opinion, which i wont describe here because i don't want to give anyone ideas, is by el toro. There is a way to literally get into the loading area, while bypassing the entire line.
Lastly, the only people I ever let cut in line are groups of small children from camps/schools. They are required to stay together and when a camp counselor or teacher is with one or two kids who for example went to the bathroom when everyone else got on the line, and it is only going o make a five minute difference or so, then i will allow it. I only do this for kids who are young though. i would never do this for a high-school student or even a middle school student. The real reason i let these children with their chaperones cut is because i too have been in that situation.