Why would anyone:
a)buy an older model of the iPhone when the iPhone 5 is basically a few months away and the 4 has been out for over 6 months
and
b)the one being offered for $49 is the lowest/crappiest one of the iPhone 3GS model
Just spend the $50 and get the $99 iPhone 4 with all the new bells and whistles and performance improvement over the 1.5 year old 3GS.
stupid people can't do math