Alot of mental healthy people will agree with you. I think the biggest problem is you are not creating something for the long term. Work or study can be used long term and builds up to a nice job / own company and ultimately freedom. In any addicting lvling game there is just no such thing. But some people have free time, not anything more usefull to do and kill time and earn a little money like this, I wouldn't say that's bad untill it becomes an obsession (Which game makers do everything to let it become).