Couldn't you make a standardized test on a single add? have a tank friend tank 1 add, using only mark or an X amount of at-will attacks to generate the same amount of threat each time. let tank buddy get hurt to half life. then burst heal him with the same rotation. See if you pull less threat (You should be able to pull…
If they sell just cosmetic stuff for $10-$20 like League of legends does. I'd honestly think people would buy more. In League of Legends almost all lvl 30's have a skin or 500 xD.