I don't quite understand why people are still buying mining hardware. Currently it will take about a minimum of 4 months to pay off one card.
In terms of interest that's almost 300%.
I think that this concept uniquely appeals to us computer "techie" types as well. The fact that we can build a machine that essentially "creates" money is compelling.....as is having an excuse to buy more stuff and get pretty brown boxes from newegg.