I will give my impressions as a European...
My last Guzzi's rear tire lasted close to 40K Km... 25K miles... but was so worn it was "square", it looked like a car tire and cornered like sh!t
Really, it was a dangerous ride...
The issue with MC tires is that the compound is quite soft compared to car tires. Paladin's right. But the traction is what keeps you alive.
If you have an issue with your tire wearing out too quickly, consider you might be "thrashing" it, i.e. you are much too throttle-happy.
Slow down. Don't accellerate WOT, do it more gradually.
SAVE GAS !!!
I fit an AVON VENOM 140/90 and commute at a leisurely 50-55mph... 70+mpg...
and after two years the tread's still all there.
If you really want a hard compound tire, consider a dual-purpose rear, like they fit on road-going enduros:
Kawasaki Versys, Honda Transalp, Suzuki Freewind etc.
They have a much harder compound... it'll last longer...