Yeah, that's a real shame knowing that the price for the ISUG GOLD subscription has grown from something about 99$ to something about 350$ !!!
ISUG should at least have a SAP SUPPORT CONTRACT, and give on demand of their members an SID that will be valid for a limited period of time, like 24 hours, just to let them find the EBF/MR they need. 
Sometimes, I wonder if this is totally legal at SAP software warranty level ? PB 12.6 is not a totally new product and therefore propose only some enhancements (I bet this is why they don't have labelled it PB 15: The piece would have been too hard to swallow !).
So it sound logical that existing features in the previous release still work perfectly in the last version, and if regressions are stated, any corrections should be available for free, no ?
Imagine you can buy the latest model of your favorite car, but that it only has three wheels instead of four and that you should take out a maintenance plan for the missing fourth wheel to finally be able to roll with. This will amaze me much that the authorities let this go really, right? Well, that's exactly what SAP is doing with PB 12.6, isn't it?