Farming can sometimes get boring due to not enough exp gain to lvl up, so sometimes when i reach a certain lvl of sp that i can upgrade what i want with having 10-15k still then i lower the gap to lvl up some more and restart the sp farming. Or you can get the premium pass or whatever that things called for an xtra 10% to all stats, phys dmg, mag dmg, exp gain, sp gain, etc.