Yeah, that's been said quite a few times before but I think that we will always see real high quality co-doms commanding a better price than a lower quality animal of the same morph. However it is just supply and demand! I believe that there is always going to be a high demand for designer morphs and some of the higher end recessives. Plus you have to remember that there are new morphs and combinations being produced every day!
To the OP in general the price on a male is always going to be much lower than a female (at least on lower end morphs) just look at the price difference between a het pied male and a het pied female! Het male is usually around $75-100 but a female will run you $5-600+ for a baby!