Yes, I'm a bit confused about how much you get for the $9 to $12 if the retail cost would be $60 to $90. Is that just an $81 markup, or does $9 only get you a frame without pedals and a chain?
On the other hand, Boston's Hubway cycle hire scheme [1] costs $12 for three days of membership. A bike for $12 could open up interesting avenues for similar bike uses as you wouldn't have to worry about getting the user to return it.
The $9 figure is the cost to make the bike, but doesn't cover the cost of moving it around, storing it or selling it. Given it's size and awkwardness to handle, it would be hard to charge much less for it. You have to factor in the opportunity cost that when you sell such a bike you are giving up almost 100 Square Feet of retail space that you could be using to sell products that are smaller and more valuable.
On the other hand, Boston's Hubway cycle hire scheme [1] costs $12 for three days of membership. A bike for $12 could open up interesting avenues for similar bike uses as you wouldn't have to worry about getting the user to return it.
[1] http://www.thehubway.com/pricing