I blame the batteries.
5--8 minutes of run time per pack, and if you're rich, you'll have 5 packs which you spent around $400 on.
Now suppose you want to recharge them Nimh's, well, that would be 2 hours of cool-down time plus 45 minutes of actual charge time, and then another 5 minutes of cool off time.
So yah, there's always something to tweak, fix, clean, repair, but I bet you'd run more often if you could.
For me, it's about 1.5 runs per hour. I give the car a full rub-down wipe-up to fill the time.