Why is the wait time for Mystic Vision is so long 15 hours? Do you guys not make money each time we watch ADs? If you do make money from the ADs why not shorten the time to 12 hours or even lower?
more players watching ads = more money to the developers
more opportunities at rewards and prizes
more incentive for other players to join or rejoin
more happy players
more ADs gem reward to incentives players to gain the 300 gem cost for a chance to acquire better heroes. and from the slight generosity they will feel more incline to spend some cash on gems.
And maybe a big Gem deal at the beginning of the month like the Dwarven gem pack deal that was shown during leveling up.