if you count all +30 gear on all server and if you by some god hand can monitor it in past you can see that sample is tooooo litlle to make any statistical result from it....
...simply...theres no enough money spent on plussing to +30 whatever we think...
...btw..dont excpect GF will tell you how much we missed....or yewels failed...
..only fair thing with plussing is to put constant perfect stones in shop or give 1 perfect for 3 failed....
..from my perspective as player at some point when that was possible some players got perfect stones...now i cant get them...