Using premium tickets in the very hard arcade mode gets you A LOT of GP. More if you run into Golden Ogre, Mokujin, Kinjin, and so on...
The GP gain in Arcade mode is pitiful UNLESS you run into the secret bosses.
You really are better off using the ticket on Ranked unless you're feeling very lucky to get at least one of the secret bosses.
It's 200 gift points every arcade match on very hard. Suppose you use up all you coins from playing both ranked and arcade, which takes about 30 mins. at most, that gets you a total of 900 GP as a minimum without bosses. (Also, if you start doing ranked matches first before arcade, by the time you finish you can wait like 2 minutes for a 6th player token)