Well you put a value on EMB via price of magic stones etc, but honestly it costs me 450,000z and about 11 minutes of time to farm 30 ~ 42 EMB. This is 15~21 Military Ration B, and honestly there are very few fights that you need it on. So the question is, if it only costs you personally 450,000z to farm that many in one go, why wouldn't you use them?
I wouldnt use them because its not rational to get them in the first place -in the current state of the game/market- and yes i put a $ into the EMB and also on the GFSS that are used to get them, so its not an arbitrary price (and i know you never said it was).
We get between 30-42 EMB per faceworm run so 3-5 Magic Stone using the lowest/rush price it would be 9-15m
Using the max price of sesame pastry (150k for getting 30hit for 3 minutes aka 50k per minute) VS the lowest posible price -in "theory"- for the Military Ration B (750k for getting 33 hit for 10 minutes aka 75k per minute) its neither a good nor a rational pick to boost your hit that way unless like i said before you are on a niche situation that you REALLY need the extra 3 hit (even after using +20 luk food or tako [not mentioning +20 dex food to keep cost even]).
You can even do more math like point of hit per Z and all that, sesame would still be on top (1667 Z per HIT/MIN vs 2273 Z per HIT/MIN)
There are more factors to get into this like a finite supply on the market vs infinite supply on a NPC, hence why i said supra "in the current state", price of alternatives, number of enemies that you are fighting (missing can kill you if you are mobbing), etc.
TL;DR: Being 10-12-2017 its not cost efficient
PS.: you can argue that setting a merch takes time to set up & sale but we all know that its not even worth mentioning at the price i listed everything and by the fact that its not mutually exclusive vs you farming stuff
Edited by Leonchascon, 11 October 2017 - 06:15 PM.