You know, I don't tend to ask for, "harder" games. I tend to ask for more challenging games, and not just RPGs. I'm not interested in ungodly inflated health pools and damage from enemies, I don't consider that challenge . . . that's just pure tedium to me. The things I ask for tend to be more complex/challenging A.I. on harder difficulty levels. I like it when games bring in new enemy types, new mobility options for existing enemies, new tactics/attack patterns/abilities on old enemy types and that sort of thing, so that when you increase difficulty the game is throwing new and interesting things at the player, for them to figure out.
When I see things like this is makes me understand why developers are hesitant to add in real challenge. When you just increase enemy damage or enemy health, you aren't really making the game harder, just more tedious, but it's infinitely easier for most players to adapt to a larger enemy health pool/higher enemy damage than it is for them to adapt to entirely new enemy types and enemy tactics/abilities/mobility options. At least that seems to be what most developers think is the easier brand of difficulty to implement.