"The EShop is almost barren of demos. Obviously having these previews available for people, certainly can help or hurt sales. Are they convinced that impulse purchasing is more effective than really letting someone get a taste?" -Play Legit
Yes because it's different when you try a game by yourself
Yes, because not only does it does it give me a feel for what's to come (and may cause to pick up a title day one if I enjoyed it.) but I respect any developer nowadays who has the confidence to let their product do the talking minus the smokes, mirrors and claims which usually reek of snake oil.
It'll help. Sometimes a game looks good but when you actually play it. It sucks. So yeah
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