The cost is just the price of doing business. We own our camper, therefore we take more vacations than we normally would. We are going to Florida for a 2.5 week vacation starting next week... a vacation that we wouldn't have done without the camper. We go to the lake 2 or 3 times a year... trips that we likely wouldn't have done without the camper. We take a lot of trips that we probably wouldn't take without the camper.
As a bonus, its SO much easier to travel in a camper with 2 toddlers and 3 dogs. Everyone has their own space... we have our own bathroom... we have our own kitchen... we have our own toys... we have our own chairs... we have our own beds.
We spend more money on vacations per year, but we go on more vacations per year. Our kids are getting experiences that they wouldn't have had. We get time with friends and family that we wouldn't have had. Money well spent, in my opinion.