Actually Custom Dioramics is OWNED outright by Bob and Susan Letterman, the founders of VLS. They also own the line of Warriors resin figures now. They did this because of a squabel with their old partner, Francois Verlinden, who has taken away his line of buildings and resin figures from VLS.
As for the costs... Custom Dio plaster kits have a lot of pieces, and that adds up to a lot of weight... in a retail store, it is often far cheaper because consolidate freigh and handling charges... do you have local dealer? And I actually doubt that their kits cost less for shipping than Verlinden - or am I wrong there?
The most expensive (and largest/most unusual) kits come from PLUS MODEL in Europe... they have HUGE buildings with loads of detail, photo etch, and resin included in every kit. Heck - they even give you lose bricks, wooden beams, and dust! But the frieght is a killer... I order two or three times a year, and the minimum order I place is $500 (to get dealer pricing). On an order of $500, I pay at LEAST $350 more in freight, because it all comes over in a freigh ship in a huge box. The end result is that a $30 kit sells for $65 to $90!
So when you look at it that way, Custom Dio prices aren't so bad, eh?