I'd certainly agree with that sentiment but, for some people, there is more to it than that. Professional gaming I imagine to be similar to professional sport or professional athletics; it is fun, at some level, but it is also
work, hard work and somedays that's just going to be done because you have to practise and not because it is fun.
Or, for people like me, having fun is serious business. I don't make light of my or anyone's fun. Not that you have made such a statement, but I tend to vehemently disagree with such statements as "it's only a game". It's not "only" a game. It's my entertainment, my fun. I'd go so far as to say that having fun is my raison d'etre. It's
worth getting serious over. But I have fun being serious about it, so all is cool.