I think they probably confused hp recovery grains and hp recovery potions. A stack of 50 hp grains sells for 10500 gold to the store. mp grains sell for a bit more.
Then again I was thinking the only people who would get good use out of it would probably need to be pretty high level with lots of hp or mp. So I'm wondering what would be a fair price. 15k? 20k?
This is on Alps server btw. Thanks in advance for any pricing tips.