[James]

I have an idea, it's probably a bad idea, but just a suggestion.

How about every 1 1/2 graal years, there is a special cave that is open, and it costs a 200 gralat admission fee (+ digging tools, you'll need a better shovel).

You can dig items up, like say there are 6 randomized hats (excluding the rare bogenera hat), and some other items like maybe 1-2 diamond axes, instruments, crafted durbys, etc. The cave is open for about 6 graal hours, and it takes a lot of digging to get one item. Once the 6 graal hours are up you get kicked out, if you did not get an item you get 75 gralats back.

I mostly took this idea from HM64 (Harvest Moon) but added some other details to it.