Jim, it's not being a nay-sayer. It's just being realistic. Like AMCDave and you agreed on, it doesn't cost more to tool up a PRR style hopper versus a N&W style. Same goes with your earlier requests for a N&W style caboose over the NE style caboose.
But from the train companies vantage point, they are going to produce items that were used by more railroads, thus giving them more production opportunties to make the largest group of customers happy. For example, Bachmann stated that was a big reason behind deciding to do their new WBB GP-38.
In addition, historically the northeast US has been the biggest customer base of the train hobby. Pennsylvania had more railroad lines running through it than any other state. Which reflects on what gets produced. It may not make you happy, which I understand, but the train companies are in business to please the largest group of their customers to make a profit.
I don't think they enjoy displeasing some of their customers with $60-$90 single train cars, but this obviously the price point they need inorder to produce these kinds of accurate, higher detail train cars and still stay in business.
After the K-Line banruptcy, Sanda Kan increased the amount paid up-front for production runs (meaning more importance on pre-orders with sufficient numbers). Then S-K had problems, and dropped nearly 60 train companies from production. Those companies were left scrambling for new production vendors, thus putting pressure on them, and helping to increase production costs. All the companies have paid a price for this, most notably Atlas.
Now add in the sluggish economy, and like AMCDave said, the train companies are obviously slowing down on new tooling. Plus they have all the other tooling, which may or may not be paid for yet. All the train companies say the same thing: it takes several sell-out production runs just to break even with the tooling investment costs... not make profit, just break even.
So you guys can keep hoping... maybe this car is already in the pipeline with one of the train companies. BUT if the business-side of this hobby was so easy, then all the train companies that have closed doors in the last decade along with all the train shops, would still be in business today.
As far as getting my jollies, well, I have learned to enjoy it as a hobby. There are items I've wanted to see made, that in 20+ years back in the hobby, have yet to be made. If I was waiting for a manufacturer to do it, I'd still be waiting. So I do it myself, and as a result, I have much of what I wanted. That's just my way of having fun. Which I think is far more enjoyable than waiting, especially now since consumers are feeling the financial pinch - as are the train makers and retailers too.