TL; DR: "It's a job" covers a lot of the reasons/excuses... AAU/Travel/etc. teams are funded by whom? How many top players thru HS can go to school, study to get the grades the need for college, train/play their sport*s*, and hold down a regular part-time job where you're evaluated on your performance. If the the boss is too hard on them or the hours scheduled conflict with their sports, they quit.
I had to laugh at this one:
"Reason 11:The player spending too much time drinking and chasing the other sex."
Um, so what were they chasing in HS? ....