I must agree. Please make it so, that we can spend Kobans to buy the Season-Pass.
But I would also be ok with buying it with money if you add some more Payment-Methods. I personally have no Credit-Card so I obviously cannot buy it, even if I want to.
Please add the other payment methods or change it, so that the seasonpass can be bought with Kobans directly.
Edit:
In the announcement, they even showed a Picture where you can see, that unlocking the seasonpass costs 3600 Kobans instead of money: