The amount of stones do not matter because of the ridiculously low chance of upgrading +10-+15. Yes you can be lucky and please don’t comment , “4 stones for +12” because you are the 0.00000001%. No1 gives a flying **** if you were lucky. You guys will see that when 70 cap gets released there will barely be 3 +15s in the entire server with all the thousands of stones used up. After that, it’s back to farming.
you forgot to say how often green and purple stones give +1. i think when they should deacrease the chance of getting stones and success upgrade, they should remove the +1 from these green and purple stones too. its hard enough