Yeah, the Gold Saucer has become a bit tiresome for me after all my playthroughs. I think it's down to spending hours racing chocobos and trying to get W-Summon, Omnislash and Final Attack from the Battle Arena.

Chocobo breeding is the best way to get GP from the Gold Saucer though. Once you breed Green/Black/Gold you can pretty much win every race. After collecting all the unique items from winning races, any duplicates you get you can just ask for the GP and some of those are worth 300-500 GP per race.

On my first trip to Gold Saucer, I always purchase a day ticket for 3000 gil then head over to Wonder Square. If you ace the Super Dunk basketball game (200 gil per turn) it gives you 300GP which you can then use to purchase a lifetime ticket from the GP lady.