They are BIG and they are AMAZING and the fuel is cheap compared to nitro. BIG engines, big wheels, big tires, big clutches, big servos, big shocks, etc, etc. Each one of those parts is quality, made to take the abuse.
That's what makes them expensive. I've wanted one for years, but $1300 is a BIG pile of bucks to lay out for an RC car. I also live in an apartment and if I kept gas in here, I'd be out of here.
The cheap 'no name' brands have cheap servos and when one of them strips out the gears...and it WILL...you'll pay a couple of hundred to get a REAL servo. That goes for all the parts. Upgrading everything that breaks will cost you WAY over $1300 in the long run. Stick a hundred bucks in a secret spot every month, just $25 a week, and in just over a year you can get the best and not feel the strain.