Hi Brad,
Up to this point, I've made certain that the postcard sets don't become a mass market item. When I originally went to topps with the idea, the first thing I emphasised was that the postcards should be for hobbyists/collectors. Too often, the term "limited edition" is slapped on a product and then thousands (or millions!) of pieces are produced. To me, that just waters down the value. Anyway, I want to make sure the Limited Edition postcards stay collectible. We've discussed bigger production numbers, but so far, I've managed to keep it to a maximum of 300. To me, that's the ceiling for "limited edition". And since the totals are so small, I always try to get forum members the first notice when they're released.
Anyway, I can't guarantee what the future holds, but I feel comfortable with the way we've progressed, so far!