Guess I'd lucky, I've got over 15k on my Pirelli MT66 (150/90) and it still have several thousand left in her. One of the biggest keys for long rear tire life is don't use down-shifting for braking, that takes thousands of the life of a tire.
Yes, but your removing some of the fun.
The 750 really does not have the power or weight to go through a rear tire fast. Even if you ride like I do.
getting around 15,000 miles out of the rear is not unusual.