The Adventurers League Player's Guide v8.2 states that characters may purchase potions of healing for 50 gp, potions of greater healing for 100 gp, potions of superior healing for 500 gp, and potions of supreme healing for 5,000 gp. It also states that an herbalism kit may be used to brew potions of healing during downtime using the rules found in Xanathar's Guide to Everything.
But the rules in Xanathar's make it more expensive to brew potions of greater, superior or supreme healing than it is to buy them at the prices given in the ALPG. For example, one must spend three workweeks (15 downtime days) and 1000 gp to brew a potion of superior healing, when one can just buy a potion of superior healing for 500 gp.
Am I missing something, or is it really only worthwhile for Adventurers League characters to brew regular potions of healing using an herbalism kit, and not any of the more powerful healing potions?