If the kit is for PvP, extra quality means it includes (at least 64), End Crystals (a stack), and Resistance potions (8:00 duration). PvE kits might include an Elytra with Unbreaking III and Mending plus a spare set of fireworks.
The 9b9t kit shop “extra quality” label is an emergent economic signal compensating for the server’s anarchic nature. It correlates with increased transaction stability but does not imply enhanced in-game stats. For researchers of virtual economies, 9b9t provides a pure case where quality claims replace institutional guarantees. Future work should examine whether “extra quality” shops exhibit longer survival times (avoiding base griefing) than standard vendors. 9b9t kit shop extra quality
Is that worth it?