I was just looking at a forum group I own/admin for, and realized that I have no idea what this feature is or how to use it.

Can anyone enlighten me?

as far as I'm aware its an incomplete feature. There's no way to add items.

I think it may have been intended as a way to promote groups - maybe some kind of group specific prizes/CW type of item?

It was never really clarified what the intent was or how it would actually work. Basically a leftover bit from the original group concept that never got fleshed out.

Ahh, I see. It's funny, I have many forum groups but somehow I've never questioned this random bit of text until now. It would be super helpful to have something like this feature implies - some kind of separate storage for group contests, for instance, outside of our own shops/galleries. Thank you for the insight!

yes it would. Its a suggestion in the Forum improvement mega-thread Oodles of forum group tweaks & updates

Oh yeah, that thread is so awesome. I'd love to see so many things on that list implemented someday!