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low/high pass filters…

why do soo few amps have them? I recetly played an amp with dedicated low pass/high pass filters built in and I loved the ability to quickly control all of my lower frequencies as well as all of the high end. Felt much more natural to do it that way and cleared up my sound in the room. Isn't that the way you would do it in the studio as well?

Why do most amps not provide conrol over the frequencies below and above?

Even with amps that have a graphic eq, your control over the bottom end stops at some point (usually 30hz). But cant you hear and feel the frequencies below that?
 
Obviously, cost for the parts and the engineering to have the HPF/LPF work effectively with the amp.
Hartke's higher end units have had these since the early 90's and more recently Mesa has it on the D800 series and I'm sure there are others I'm not aware of. If Talkbass's love for the new Mesa is any indicator of sales for this amp, we may see more manufacturer's start to incorporate HPF/LPFs in their designs.