i have a very nice idea, why not make it so everyone who has reached level 70 in the POB will have that stone for free on their first created character and it will bind, that will not only make it fair so everyone can have it but also motivate people to play more and reach that level 70 so they could test skills and find bugs and if you can get it for free then there is no reason to not add it to cash shop so people with more money then time or just simply want 2 or more character with it could also get it.
not such a bad idea but not for free servers must go ahed, i think it wil just when u are 70 u be able to buy it. But the real fact that its so hard to programe it and a waste of time to do it so i think its not possible haha. Just put it on the shop and done for a higher price... 50-100 cash point.