The cost of these toys is cummulative as population rises beyond carrying capacity of the system. Noise pollution, air pollution, water pollution, pollution from resource extraction, pollution from industry creating the toys.  I like boats and 4 wheelers too but it costs everybody to have them. Im ok with folks having toys, but the consequences on everyone is useful to consider to minimize harm. I just want folks to be happy and healthy. I want you to have your toys but not if it harms others. The ethics of harm is very compilicated and there are no easy answers. Some balance of having toys while minimizing harm at the same time makes sense to me.