Ah yeah, I had a marketing/sales friend who did that the other way around: he made nice mock-ups, he even built powerpoint presentations that seemed to show the UIs actually working; he made credible ads and sales documentation with it, and he sold countless non-existing snake oil products this way ("available soon!").
As he simply was the marketing/sales guy, in case he found himself cornered he could always pretend that the failure was on the dev/technical side... "see with the support".
He could also successfully sell himself this way: once a billionaire proposed him to be the sales director of some company. He set the meeting at 7AM at the Ritz bar, and got the job (not for long : he had negotiated to keep the perks when leaving anyway).
As he simply was the marketing/sales guy, in case he found himself cornered he could always pretend that the failure was on the dev/technical side... "see with the support".
He could also successfully sell himself this way: once a billionaire proposed him to be the sales director of some company. He set the meeting at 7AM at the Ritz bar, and got the job (not for long : he had negotiated to keep the perks when leaving anyway).