they know that too, actually. they know there are amateurs out there who are good or even better than them. they know they might not be able to maintain their talent and inspiration forever. they know they might be only very mediocre in this cut-throat world.
sure, there are those who are honestly just the best in the world, and they are pro for that reason. but by definition, there is only one, at most a few, "the best" in the world. and there are millions of pros who do things for a living that others consider their hobbies.
now, i admire their courage. many of them turn pro, attempt to make a living out of their passion, knowing full well that they aren't likely to be the best in their profession, knowing full well that somebody better will come along at some point and eat their lunch, knowing full well that there are enough amateurs out there to seriously diminish their value.
sure, some of them are only good at marketing/untalented/have delusions of grandeur. but many are totally cognizant about the harshness of reality, and hella scared of it.
and they still do it.
