Your key point here is "gil potential."
There there are 2 assumptions that you are using that I would like to refute. 1) There is no guarantee that your material will sell for 200k nor can you guarantee when the materials will sell, but I do know my 150k product will sell before your 200k materials will. 2) you are setting a valuation on the sum of your materials that may not be universally held. See my quote below:
My theory is based on quick inventory turnover. This is my business model and works well for me (this may not be something you like but no one is forcing you to use this method.)
There is an old adage: "A bird in hand is worth 2 in the bush." I will take my gil-in-hand over the potential more profits for me.
Zigkid3 succinctly states my point.
Also, the fact that he/she farms all the mats has everything to do with this. By farming the mats, you are reducing your CoGS thus increasing your profits.
To use your example, if I really need a wind shard bad enough and I am unable to obtain it myself, then yes I would buy it for 100k a pop. More to my point, we both know that certain materials/product are farmed/crafted more than others.
Lets take something that isn't readily avail, for example lets use a Black Pearl Ring +1. Now this ring is required for your GSM lvl 50 quest. I was able to go 3/3 on creating +1s so I put the other 2 on the MB. Saw that there were no +1s on the market and the last +1 sold for 8k. So I put my 2 up for 20k (2.5x the market history rate.) Within 24 hours both had sold, but a few others found that out and price dropped (my "niche market" was over saturated but I sold what I wanted.) Yes, it was stupidly high compared to the "sensible price" yet it sold cause there was a demand.
