I think you "need" mass mana in PVP cuz the 1v1s can last 20+ mins. But when they run out of mana pots out in the field and or it has dissappeared, they go to A2 and buy MORE mana pots from NPCs that don't heal you... So that you can keep putting more mana out of the field. So mana is useless. Cuz PVP is pussy shit. Just wait for enemy to run into your spells eventually.
This would only work if you have an extremely smooth brain. "Erm yes, I've teleported all around and haven't seen my opponent on the map for more than a minute". Leaving the moor = auto lose. And if nobody cares about that rule, then why isn't everyone just going back to town to akara, since the rules don't matter?
You must've seen a single person ever doing this and now you've imagined some scenario where this is a real thing.