The issue isn't with the players, the issue is with the pool industry, it is bankrupt and has no money like other sports, for example a decent player that doesn't do so good on tennis, will earn more than the #1 pool player, doesn't this make you laugh?
Now as to why they don't get jobs, let me explain it to you, I am a worker just like you, and I play pool as a part time because it's just a hubby and I accepted it to be only a hubby and nothing more, and I work everyday, this resulted in me not being able to attend big tournaments that are far away, why? Because I can't get time off work, but I accepted that.
For example all of my friends are now in Doha playing the qualifier matches to get into stage 2 qatar world championships, and I couldn't go with them, why? because I can't get time off work, and pool remained a hubby of which I play once or twice a week.
I hope that answered your question about the players who wanted to take pool more seriously but have no money, and my hats are off to them because it's a suicidal choice due to my #1 point on this post, POOL HAS NO MONEY.
And why doesn't it have money? I think I know, but it will open up another discussion and needs so many paragraphs to explain, which I am not in the mood to do right now.
Sorry for the bad English, it's not my first language.