1 def = 1 def pure.
2-19 def = pures who accidentally got def levels.
20 def = initiate pures
30 def = proselyte pures
40 def = rune pures, but they are more mains than pures, because rune is not made for pures.
There are different types of pures, as jagex comes out with new armour and updates, the definition of pure could change. Just because YOU don't think 30 defence is pure, doesn't mean it's not necessarily pure. 30 defence is, and shall always be the maximum defence level to be considered pure. Sure, it was 20 once upon a time, but before that it was 1 defence. Sh!t changes, and people adapt to it, so get used to it. People don't get 30 defence for combat levels, nor do they get it because it makes them beast f2p solo pkers, they get it to wear proselyte, or for clanning purposes. Most clans have a few members with probably 30 defence, and to be honest, it makes no difference whatsoever in terms of clan pk run-ins, it's simple...if your clan can't ko someone because they are 30 defence, then your clan is sh!t. If you think they fail to solo pk because of their 30 def, then who cares? It's someone elses account, not yours, and they can do whatever the hell they want with their account. Your opinion isn't everyones opinion, and your opinion, and this topic, isn't going to make the slightest difference in the world whatsoever.
You think MM is the almighty #1 pure clan and the only pure clan left? Thats bullsh!t, cause if they were the only pure clan left, the rest of us wouldn't be here on these forums right now. Your getting brainwashed by the OPINIONS of MM staff about 30 defence, when really your the only ones complaining. RS has changed, pure clanning has changed. Man up, grow a set, and get used to it bud.
No flame intended btw, just stating my OPINION because im allowed to do so.