Eventually you run out of space, so it becomes easier to not impulse buy that eflite F4 edf. Of course the wife told be to buy it 20mins after I left, so might have to back tomorrow to avoid not doing what I am told!
Seriously, only time it is an issue is if it causes deception to the family. Then it is an addiction. And well, addiction to anything can be bad. But as long as you tell your wife you bought that $15,000 jet hanging in the hobby shop, there is no issue. I mean the kitchen looks fine to me, so that money is better spent on something useful!