Well if you do completly stop playing remember to donate your money and all your goods to the
Save Vivec Foundation 
(I'll gladly take everything but your AF, and loan you money when you want to come back
)
Also, I see what you guys mean, the Exp curve becomes completly destroyed once you hit lvl 50. Check this out:
Exp Needed chart
lvl50-55: 69,000exp (Equal to lvling a job from 1-23)
lvl55-60: 100,000exp (Equal to lvling a Job from 1-29)
lvl60-65: 160,000exp (Equal to lvling a Job 1-39)
lvl65-70: 180,000exp (Equal to lvling a job 1-44)
How many 200exp fights you need to just to each limit:
lvl50-55: 345
lvl55-60: 500
lvl60-65: 800
lvl65-70: 900
It takes 221k exp to get a Job to lvl 50... in the time you spend lvling a job from 50 to 70 you could have taken 2 other jobs to 50 and another into the 20's. If that isn't incentive to be what race and job you absolutly love, I don't know what is.
I think I'm going to take my "main" job to 50 and be happy with that... that as far as I expect my fun to go with the game. I may go further but that's unlikely.