Hi Andy, think I saw that episode of Dragons Den....this was the firm that couldn't attract investment..
eDv - the family media company :: Budgets
they're not cheap....weddings start at about £3k so if ZVI gets work like that he can pay back any investment pretty quick....having said that...there's no mention of camera, filming etc and it seemed to me the "pitch" on the Den involved them taking existing footage and editing and assembling....but as you say....they make a few quid at it!