Both of our valves, recirc and atmo, retail for $170.00. Also, most everyone that installs them gains (or more accurately no longer looses) 2-4 psi of boost and sees an enormous increase in driveability and transient throttle response. Some are seeing such a large increase that the OEM fuel pump is no longer adequate to meet the increased demands of the engine after the leaking factory valve has been replaced.
Let me make an analogy... running the OEM valve is akin to running your AC with the windows open, sure you can get cold but your air conditioning system is working much harder to achieve the same results. Instead of cranking up the fan speed or modifying things to spin the compressor faster why not roll up your windows?