Originally Posted by
Totaltotemic
It's actually a bit bigger than it seems, mostly because we use RM on cooldown on most fights. If used every 8 seconds, that change results in 1219 mp5, or 1,000 if we're going to round it off because we're not always using it. If we convert that to Spirit (finally found this number, it's 0.564 mp5 per 1 Spirit), 1000 mp5 = 1,773 Spirit. If we didn't round the initial mp5 (always use RM on cd without fail), it's 2,161 Spirit.
Edit: Thanks to Chimaera for pointing out my brain fart, it's roughly 3 times what I thought it would be because I flipped the conversion around. It's actually a lot more in terms of Spirit than any upgrade in item level.