Big fish small pool?
As a pro you have to earn your way on to the tour, very difficult to make it to European tour. Justin Jose missed how many cutts after turning pro ?20ish
Whats happened to Richie Ramsey, John Parry? etc.
If you build a good am record, more likely to get picked up by a management team, plus sponsor invites.
Might not like travelling?
Not enough Backing?
Might not be Abel to cope with the change to tour life style?
Might want Walker cup selection?
just a few i could think of.