That’s the highest idea, I’d much rather go in the range of 12 emeralds for the ultra kb TNT.
I think the snowball price was fine too, but so many people are griping about the spammers that the PPS (Price Per Snowball) would have to be higher. See this post:
Dorys not working 1/2 of the time, its intentional that way to combat their insane overpoweredness. (I think so anyway.)