Very true! And that is why I only get 7,000 miles out of a rear tire. I love twisting the torque out of the big girl. 'riding'
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Obviously hard riding will cause more "scuffing" of the tires and faster wear than anything else, and BOY is it FUN!
I think the only improvement with increased tire air pressure is...Less tire contacts the road surface. More physical contact means more tire to wear off.
Here's a great Motorcycle Tire Wear information page.
Less contact area will apply more force to that lesser area, wearing it more. I think it is a wash.
Consider filing a 2x4. If you file a flat area, it will take a lot to make any difference. If you file a corner, you will make a difference quickly. Either way, you are removing about the same amount of material.