Well the reason I talked about guide is bcs I have no idea what you are talking about, I have not seen "all people want max potions on all classes", so thats why it would help to show specific example.

As far as I can say there are only some builds that use Potions on pants, and its all in Imbiber builds.

I have never seen people use this affix for like defensive purposes or in general or anything like that.

My example is the trading section on this site. But I could be wrong of course.
I have to admit I havent played this game for quite a long while before the Paladin released and I wasnt aware of this glyph at all. My knowledge on D4 is pretty weak, so I was wondering why "everyone" (in my perception) wants more potions if you never need to use one. So this clarified a lot for me already.

ye but i thoguht only robshammerdin used that