Just to note, technically you can buy resin with money (you can replenish your resin with primogems, up to 6 times a day), but it's not very cost efficient so y

Just to note, technically you can buy resin with money (you can replenish your resin with primogems, up to 6 times a day), but it's not very cost efficient so you're generally better off using those primogems on wishes. And like you said, you eventually run out of things you'll want to spend extra resin on.