it totally depends on what your looking for, for me? yes i like the feel of a higher quality mouse not only that but they come with a lot of extra features. DPI wise then yeah pretty much all "gaming" mice go way over kill on it, i highly doubt anyone plays at 5600+ dpi, personally with my naga i only use 2400.
the reason i bought a 80$ mouse and a 150$ keyboard is for a couple of things, the main reasons being macro support and a lot of extra key binding's. having a 17 button mouse is something that now that i have had it i doubt i will be able to live without it as i use all 12 side buttons every day for tons of different things, be it macro's/commands in editing programs or key bindings in games.
but in honesty if your going to be buying a high end mouse then your also going to need to dish out the money for a high end mouse pad, for the longest time i made fun of people who spent a lot of money on mouse pads and after buying one my self and seeing how much of a improvement it is i feel like its useless to have to have high end mouse without a high end mouse pad because what is the point of having such a high dpi for tracking when you have a crappy mouse pad where it doesn't matter or it picks up on bumps and moves your cursor that extra centimeter
