Vanilla Black Lotus supply doesn't meet Classic demand on modern "medium" and "high" pop servers.
Hopefully Blizzard will implement the Pserver fix with 50+ BL spawn locations and decreased respawn times.
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Edit:
As of right now (when flasks are not necessary), my guild wants to flask to speed clear Molten Snore in 30ish minutes.
But there's not enough SUPPLY to meet the DEMAND!
We want to flask...we all have the gold to buy a 150-200g flask...but there' snot enough flasks or lotus on the AH to make this possible...even though we all have the gold to buy it...
this is the problem.
(also we want to flask for WSG premades...we got the gold...but there's nothing on the AH).