If you beat the piss out of your bike, you'll most likely need a valve adjustment at 7500 miles. If you ride it normally (not bouncing off the rev limiter), you most likely won't even need a valve adjustment at 15,000 miles. (This info is based on 796 owners' experience.)
If you do want to do the valve adjustment for peace of mind, you can always go to an independent Ducati shop that'll be prob. about half of what Ducati dealers charge.
Keep in mind that anytime you do your own work and/or have work performed at an independent shop, it's critical you keep your receipts to prove to a prospective buyer (if/when you ever sell your bike) that all maintenance was done. Also, in the event that you do have a warranty claim, you'll also want to prove that all services were performed on time. The air cooled 796 motor the Scrambler's engine is based on is reliable and bulletproof, though.
Though it's a completely different motor, I'll add that my 1199s valves were in spec up to 30,000 miles. And I didn't baby the motor by any means.