[corin_]

I don't know what competition you have, but you've priced at several times higher per card than I would expect to pay - and regularly do pay - for (nice quality) business cards..

edit: And in terms of use case, I don't quite get the whole "business card for your app" idea. Business cards are about sharing contact details, sure the aim is often to make a sale, but it's not to directly drive a sale. I just can't personally (I'm not an apps guy, but I am in marketing) think of a time when these would be more useful than a business card, or on the other side more useful than a small flyer/leaflet.