I've spent a lil cash on the Gem Mine, but I play a LOT, and promo codes are fun.  If we're allowed to use 1 per day, don't you guys think you should have a few per month that actually work????  It makes it more fun, adds another aspect to a game that's already pay2win, so, why not?  The content of promo codes is choosing when to use them, so as not to waste it.  But NONE work.  C'mon.