Fishing should be the easiest job to grind... Since R1 you can fish in Grade 10 Points (Try to find your own favorate point ^^), and get 300sp per bite till R50. Hourly SP should be 16k+ and it'll take around 100-120 hours to hit the cap. That's why you see so many R50 Fishers, much more than capped Miners or Botanist who currently don't have gathering points over Grade 5.