Most of those look expensive. Too expensive imho. And business cards should be atleast somewhat near standard sized, so that they easily fit to wallet etc
Agreed. Expensive business cards, like viewzi's, really have no place in a technology startup. In fact I would say it's a sign to approach with caution if a startup is wasting money on superficial nonsense like that.
However, the designer in me still loves a great card. As print becomes less prevalent I miss the textural experience a screen can't provide such as the feel of paper, emboss, deboss, foil stamps, spot varnishes, die cuts, etc. If you can afford it, I think it's okay to splurge a little here.
Most of those cards seem to be for companies with a more artistic nature. Architects, designers, printers and the like. For companies like that spending time and money on business cards is a good idea, since your business card in effect becomes a mini portfolio, and the first example of your work that potential new customers will see. If you're a graphic designer and your business card show no indication of design skills (or worse, bad design skills) I'll probably be less likely to call you if I need design work done.