Maybe in the US. In my EU country(Austria) second hand hardware prices are through the roof. There's no way you're getting anything half decent from the last decade for $75.
And then there's the cooling and power consumption difference between a 10 year old system and a RPi. It's not even close.
And then there's the cooling and power consumption difference between a 10 year old system and a RPi. It's not even close.