"Be warned! There is no choice of product or any indication of what you're going to get. I've just purchased an item from my wishlist and used the Grab Bag. I have ended up with a random product dumped into my purchases, something I've no interest in or use for.

I suppose I haven't actually lost anything but it does feel like misrepresentation. "

The Grab Bag is a fun thing!   The whole idea is that you're not supposed to know what you are getting, other than it will be a quality item representing some participating vendor's work (and every item I've ever received has not been a shlock or second rate item). While there have been items I haven't used yet, there also have been items that I would not have otherwise purchased that turned out to be really enjoyable and an unexpected pleasure!  They gave me a new appreciation for a vendor's work that I was otherwise passing over. Other examples are 2D picks that two years ago I was not really into, but now two years later I am glad to have them in my library.