I never been on such a website, but doesn't this make people angry? Or is the trick to do it also withe fake product and company name, so that you know it would work, but noone can hate you afterwards for lie to him?

Kickstarter seems like a better approach, since everyone KNOWS there is no product to buy.

If I put my credit card number into a site and the next page said "actually this isn't real, and we promise we didn't save your card number", my next step would be to call my bank and cancel the card.

"Build a fake checkout"

Are you serious? That's a criminal act called fraud.

Please don't follow this advice. Just do something legal like having users sign up for a mailing list.

This is the worst advice I've ever seen on HN.

Much better to have PPC + landing page and a "tell me when this is available" signup.

I'm sure this works for things which you might buy having only see the website (and maybe a few screenshots) but beyond a certain level of cost/complexity you actually need to have some real software for them to try before they'll pay.