Again that is exactly how the RNG thing works, sometimes you will get a loot sometimes not. While I don't deny the fact that the KR team can change the % as which the frequency of the event which triggers the fragments to drop, I honestly do not see the point in them doing so since you could always buy gear in things like trove to speed up your progression. Just other day I ran it 10 times and came out with 2 gloves and @ 14 fragments.
Also about your failure rate, my guess as most if you use 8 stones will be roughly 40%. Your result again is RNG base on 3 possible outcomes. A normal blue, a superior blue, a purple. Same applies for when going for legendary. When I refine personally I only do so with 8 stones and while I'm not going to lie and say I get purple every time, it happens more then not. What people need to realize is while whales will have some advantage, overtime things get reductions which I'm sure Unity will be no different and they will lower the % to fail in order to help others catch up to a point. Much like they did with Souls, will do in time for other items. @Javice Low fps and such are more or less due to the engine and how badly coded the game is which might be fixed with UE4, might not only time will show us. Your ping is based on your internet in most cases, so it is 50/50 their/your problem as it also depends on server placement for say EU. I mean from what I can tell Texas is where the NA server is located and I'm in Maryland with roughly 60-100 ping in most times, 150 at peak. They redone and buffed gold amount on 2 key dungeons, Heaven's Mandate and Cold Storage which now a days you can complete just fine out of story. All the way up to Shadowmoor baring mechanics of RT is a snooze fest for everyone so I don't exactly see a issue with gold. Hell they can faceroll (knowing minor mechanics of course) things like skybreak now for another 70-80 gold and start to learn / run SK/VT. But they also shuffle materials around not really nerf it. Again it is the community that limits others on 'what they feel they can do' just to speed up their dungeon runs, doesn't mean you need that in order to actually run it and therefor sets a bad example making new players think they truly need to be "end game whales" in order to do dungeons like warped citadel ect..