Question about rift mmm

[R0B0TED1]

I made a rift mmm guide, but after checking the rift prism prices again, they were around 750m. I don't know if my calculations are right, but crafting reflection books makes around 5m more than mote grinding with 2 mcgrubbers. can someone tell me if my calculations were wrong or not? i don't want to gaslight on my first guide

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