I'm kinda stealing this idea from Triplescrew from a thread in general discussion, but nonetheless I'm still posting it.
Prestige missions are basically useless other than a pretty badge so what if when you completed all the daily missions (including the Danger Mission), you get an orb of alchemy or some fire crystals?
Since everyone complains about orbs anyway, this could be a solution.
Or maybe if you complete at least one mission for 5/10 days in a row you get an orb?
I would also like there to be 50% more enemies rather than 50% more hit points. More fun, more interesting, more rewarding.
It's fine to have a bit more health on enemies, but at some point non-dps weapons just get left in the dust.