you must remember, when you buy a top speced camper the the factory includes things like a fridge, they are going to put there mark up on it. And more than likely your buying there name. you can buy a 10k CT and spec it up to the max and not spend the extra 20k like they wanted. also you can do a lot of repairs (lets face it, even the top of the line 35k CT will have something go wrong) for that extra 20K.
I also see it as a time thing, if u have time to buy a 10K and do some work your self you can save tons, or if u want to call, the dealer, purchase and tow it away to your first camp, that comes at a price. So i guess, conveniance has its price too.
With our CT, im quite handy and im a stay at home dad, so i have the time and ability to modify my self, as apposed to taking to a repairer/engineer to be modified.
IMHO
Cheers