FTO's have flirted with much more modern and efficient types and the 150 now does little for those with penis problems but it is still hard to knock as a cheap basic trainer particularly in the USA with much cheaper fuel and parts.
Inevitably, prices are falling in a recession but, also, because any 150 is now older than most students ! However, very much like tractors, a cheap and old but well-maintained machine is perfectly adequate for most purposes and especially training- but you must be prepared to spend the money to keep it that way.