One of our members played and got 7 Pentagons on half a hopper.
The problem here is twofold. First, they added a single strike to an already in play series of three. That means if you already have the first three, you get stuck again. Second, many casinos use racks of strikes that were cashed in, because, as with Suncoast, they are in the nearby change booth, not a bank or vault. The returns don't get Pentagons returned because we are all keeping those.
If all the strikes are going to be issues of 1750, they should be doubling up on the Pentagons or that's all that will be left at the end of the run.