This was my strategy from a wile back as well, the problem is with the change of jobs and how they are used, many jobs are being left behind for the end game events like ifrit and the mogs. Only battle job i have to 50 is my pug, i LOVE my pug and have very nice equipment but because there are faster ways to burn the end game content down i never get into partys to do these =(. If i spent half the time i use to lv up my crafts and gathering id have half of the battle jobs maxed easy but as it stands I have some nice crafting levels ready to craft up the sweet gear as soon as they release it ^^. looking back i wish i would have lvd at least 2 other battle jobs to 50 tho.