are people that buy these just stupid, or am i missing some kind of point?

it's all about the geekness.also they are more precise in drawing/gaming/whatever. also ergonomic is also better on most. but depends.

having some extra buttons to program functions to is useful. in FPS Games like Counter Strike Source having the reload, switch weapon, and voice chat all programmed to mouse buttons can make things easier. I don't find adjustable DPI very useful though.

adjustable dpi is nice for precision mouse-work (digital art, even though that's what tablets are for) and cases where i may need to swap my sensitivy to switch a role in-game. (twitch shooting requires higher sensitivity, sniping requires less)

while so, i don't even play games that often, so it isn't just a "gaming only" sort of mouse.

plus i tend to prefer a well-constructed, sensitive mouse over some oem, shoddily constructed, doubleplusunsensitive rodent. i know this isn't the case for all oem mice, but yeah.

really i guess it just depends on the user. but that's just my two cents.

microsoft basic mouse. two buttons, scroll wheel. one of the best mice I've ever used, and I've used a lot. considering it's a $10 mouse, that's both awesome and sad.

I have a $50 Logitech Wireless. My computer setup almost demands for a wireless mouse since the computer is tucked aside in a little cabinet thing, and wired mice usually don't reach. I also have brand loyalty. I've used different brands of mice, and they all sucked and/or died sshortly after purchase. Except Logitech. Logitech has always been good for my needs, so I stick with them, even if it means spending extra money.

I have an MX Revolution, and damn it's sweet. It retails for $100, but I picked mine up for $30. I wouldn't want to ever use anything less, but I'd never pay more than, say, $40 for it.