Because you said so?
Again you are setting yourself up as the arbiter of standards, not to mention a mind-reader. You claim to know both what the standard of "commitment" is and also what is present in another person's mind. Surely you see that this is simply projecting your own attitudes, beliefs and experiences onto others.
Is some one who trains 2 hours a week committing as much time as some one who devotes 8-12-24 hours a week?
There's nothing wrong with committing 2 hours a week, it's people's need for validation I think that leads them to wanting their 2 hours a week to be considered as serious as some one who devotes the better part of their life to the art.
2 hours a week, it is a fun recreation for you. Nothing wrong with that.