Quote Originally Posted by VillainX View Post
I'm worried about the gem cost of medals past that point. It seems to me Purple medals would be required after 9 stars. If the fail rate is not dramatically increased in using the purple medals to star, it will become VERY costly to go any higher than 9. I have yet to see a purple medal drop anywhere in game, only seen them in fair and lab for sale at rather high cost.
I don't know how accurate this is, but this thread seems to have some data on success rates past 9 stars: http://bbs.tynon.com/showthread.php?2130-10-Stars

Granted, this was earlier in beta so things might have changed, but it looks like it costs three Purple Medals for Gold level heroes (ouch, so 100+ gems per attempt at minimum), and 50% chance starting out. Kind of harsh.