Manufacturer overclocked cards

Kangsta

Distinguished
Sep 15, 2010
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18,510
So I want to buy a Geforce GTX 460 1GB but I've noticed on newegg.com that there's a lot of cards that are selling that are already overclocked. Usually, the overclocked models are 10-20 bucks more expensive.
I'm just wondering why did they do that? Is it worth buying a card being sold as overclocked? Could you just buy a normal card with clock speeds and then overclock it when you get it??? Or did the manufacturers sell all the crappy cards that can't overclock at stock speeds?