Deadly Trickster might not give you stat bonuses, but it makes up for it in other ways. For example, the trickster is almost dead, has expended all his encounters and dailies and BAM! Full health, all his powers back. And it takes him a while to run out of powers in the first place; on an 18 or higher it's not expended. Demigods just get to keep using encounter powers, and only go back to being bloodied when they hit 0 HP. Archmages get to reuse one daily and one either daily or encounter. When they get to 0, they lose their dailies.
All in all, they're balanced.