I've seen many people say the same thing about the kb being more expensive but once you add everything up they are just saying that because they are not comparing a comparably complete kit (injectors? fuel delivery solution? chip? tuning? intercooler? etc.). Turbo's tend to be the most expensive (more than the KB) and require quite extensive mods to the engine bay in general.
Also the procharger might have a nice peak hp but I'd rather have the torque of the kb down low (full boost at like 2500 rpm). Especially on these 4V motors (high reving with very little torque down low) To each his own I guess.