Three days, just three days!
It took just one idea from Wu Wang and the concerted efforts of the entire Annihilation Sect. Elixirs from tens of thousands of miles around were bought in bulk at low prices. Then, in several bustling market towns a little further from the Annihilation Sect's gates, they were all sold out at standard prices using a 'raffle' method!
Earning Spirit Stones is fine, but not adding extra burdens to Human Domain cultivators is indeed a reflection of a certain Sect Master's conscience.
When some cultivators began to imitate, with various promotions like 'buy Elixirs for a chance to win mines,' 'buy Elixirs for a chance to win magic treasures,' or 'buy Elixirs for a chance to win a cultivation partner,' the Annihilation Sect, upon the Sect Master's order, somewhat inexplicably withdrew from the Elixir market.