Well to be fair, the PC games industry had shareware and demos a long time before the console games market. It was only since distribution became cheaper so that discs containing demos were released. Most of those were avaliable only in magazines as well. Demos typically only feature casual gaming, because no one wants to try and turn GTA/Gears of War/Fable into a 10 minute demo. People use trailers for that.
I suppose the DS and PSP have a lot of demos, but only because the filesize is fairly small. No one would download a demo for 4-5gb (probably).
(BTW: It wasn't till I was 21 that I finally cleared AE with 100% save rate)
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