As for how much a camp can/should or is reasonable to charge there is no answer. Every camp would and does have different variables such as mortgage on the property, number of campers, number of staff, payroll for Rebbeim and other employees, supplies needed, insurance, expenses and so on. There is no way to compare one to another and no way to assume whether one is fare or not. Fare is choosing a camp that fits your budget and hashkafas towards your kids. If your kids are happy you are happy, and if YOU are overburdened and financially drained the kids can feel your stress and cannot possibly be happy.
Everyone needs to learn to live within their means and budget themselves accordingly. There is always going to be someone out there who is going to do better and afford more than we can. There is always going to be someone out there that will start a new trend and get a cazilion people to follow them. Remember the Torah tells us neither a leader nor a follower be. One must determine for oneself the path they must take, and they have to do so without considering what the neighbors will say.