I think the current system is flawed 9 rengol lockeds to make 1 massive locked? Makes more sense to save gold and just open 3 rengol lockeds which has same chance as one massive locked.

Note: I am a non plat player I haven't bought any platinum.

I propose you change the prices of the lockeds.
Rengol locked normal - 7 plat to open
Large rengol locked - 11 plat to open
Massive rengol locked - 14 plat to open

Feedback and suggestions appreciated