Tower of fortune

Well,can you tell me what's happening with the tower of fortune? Until a few days ago,i played every 19 hours, and when i got a pig i was charged 20,100 and after that each time 200 gems. Now,since a few days ago,20,50,100,200,400,800,1600 and after that i couldn't get furthermore. I've spent money to have treasure chest opened after 15 minutes,and a lot more for this game. It was actually fine to spend 2000-3000 gems to take a shot for a fancy hat,but now,just boring. Can you explain why the sudden and unfair change?
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