Over here some people are collecting old farming tractors, old Lanz Bulldogs and the like. Collecting cameras seems to be comparatively harmless to me. Just buy a glass cabinet and put all cameras you don't actually use in there. Most old cameras are a joy just to look at. There may come a time where you have a desire for one of them to use. You then don't need to buy it again. Just go to your cabinet and swap cameras.