Why in the world would BB increase the limit on gem pits? I'm pretty sure whoever approved the gem pit idea has their photo scotch taped to a dart board behind the door of the CFO's office at BB HQ after costing the company massive revenue in gem sales.
If gem pits were only available for purchase with cash, I could see BB making more of them them available, but I really doubt they're gonna convert "buy one gem pit, get nine more free with a little patience" to "buy one gem pit get 19 more free". Better pinch yourself, you're dreaming.