Jim,
There are several facets to this issue:
You are comparing apples to oranges in your post. The DPM are the simplest, cornerstone are similar. Campbell kits have many more parts and detailled. Most of the $200.00 plus craftman kits build contest quality models that have 100’s (if not 1,000s in some cases) of parts and will take weeks to put together. Most of these kits are to scale and come with tons of castings and other cool stuff.
As to the cost, you are quoting MSRP. I have almost never paid MSRP for a kit. As long as you stay away from collector kits (FSM, Yorke etc…) you can find most of this stuff steeply discounted at hobbyshops, trainshows and Ebay.
My main theory about kits is that nobody actually builds what they buy. Every train guy I know has at least 5 or 6 boxes (i currently have six) of stuff that they havent built yet sitting around. I’m sure that most modelers who have been in the hobby awhile are like this. Interests change, people decide to change scales, run out of time etc. The upshot is that there is a big market in secondary kits floating around, almost always for lots less thanh MSRP. Check kits on Ebay. Last time I did a search I came up with over 5,000 listings.
Many kits are still not all that well detailed so watch out. My standards are very high when it comes to details, so I’m sure I’m going to step on toes here, but old Suydam, Muir models, IHC, Model Power, etc are very crude when compared to todays modern laser cut kits from companies such as AMB, FSM, Banta, Crystal River, Sierra West, RIo Grande Models, Grandt Line, SS LTD, Evergreen Hill etc. Some of these kits are more expensive, but they are much better kits in terms of detail and IMHO offer better value for the money. Old kits to look for include: Columbia Valley, Magnuson, Yorke, Cibolo Crossing, Lytler and Lytler etc. Campbell kits are nice but many of the details are now oversize when compared to newer kits and the wood they use has ve