It's AIDS!

In her past life, the market eventually stabilized quickly. Players who had learned alchemy during the beta tests began selling their beginner healing potions, and the official game developers also started mass-producing potions to help players get through the initial stages. At the same time, modern medicine stepped up, creating treatment options in the form of injections, pills, and capsules. There were plenty of ways to heal. 

However, with a market of over ten billion players, even the fastest methods took time. Healing items, unlike belts, were consumables. A belt might only be bought once, but healing potions were used up instantly, ensuring that anything put on the market was snapped up immediately. The market for beginner healing potions alone would stay hot for at least two weeks.