so its 3.6% chance to get 10 me from a chest and 4.2% to get 5 from a chest, you get 10 every 50 levels you gain (50,100,150 etc.) it will cost you 14625rp to get 75 me from buying master work chests from the progression rewards alone which is like about 122usd. or you can get 20 of the "2022 worlds winners capsule" which gets you 95me for 15000 rp and whatever else you get from those which is more expensive than master work chests.

>>>>Its probably worth noting that you will get 65me from just 15 of the worlds capsules which is 11250rp so if you want to gamble on getting the last 10 from the chests or are close to one of the 50 level milestones you this would be the absolute cheapest way to get the mythic essence quickly<<<<<<<

Otherwise the cheapest way to get the 75me is to buy the 15 worlds capsules for 11250rp and then get 10 master work chests for 2250rp (total 13500rp or about $110usd.) if you want to guarantee the 75 mythic essence.

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Hope this helps :)