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Because generally higher is better, just like screen hz :) Assuming v-sync off (I can't stand the input lag it creates, even on AoC), 200fps looks and feels better than 60fps even on a 60hz screen. Just like 144hz looks and feels better than 60hz even with 60fps.
There can be reasons for capping the fps and I do it myself in games where my framerate is really high all the time (or games like Skyrim/Doom 3 where physics go nuts when framerate > 60fps). But that is besides the point, a GPU (or a whole computer even) shouldn't overheat no matter how much work you're giving it, it's that simple and why Galadh and me said what we said.
A properly cooled and designed GPU won't die easily even if you run it at 100% 24/7 so the "hardware will last longer" is very irrelevant IMO unless you're keeping the same hardware for many many many years or can't afford to replace/fix bad hardware. We're not talking about mechanical or perishable components here :p
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What Fass said. I use Rivatuner (also use Afterburner) to limit AoC's framerate to 60.
There's no point getting up to 300 fps in a few areas when, in most situations with a lot of characters and particles in the same place, fps will drop a lot under 60.
It can take a few days to get used to playing with 60 max (if you were used to a higher framerate in other games), but it's perfectly playable.
