Random comments:
In the end, the cost of model trains isn't relevant once once chooses which scale to be in. It may be a factor initially, but as Michael states availability also weighs in. However, once a person jumps in with both feet, it's more a question of value and perception.
I'm happy being in S. After 30+ years it's amazing how much of "nuthin's available in S" I have. I periodically think of going back to HO, but there's nothing really compelling me to do so, no matter what Rapido Trains announces 
.
S is a tough scale to get into nowadays. It was easier 18-20 years ago (egads!) when SHS was in full gear producing a relatively steady stream of product indicating stability and growth in the scale. While Lionel has taken the lead lately, in spite of FlyerChief and Legacy electronics, I'm not sure how much longer they can continue to successfully churn out recycled or redesigned traditional Flyer. The Berkshires are a good move, but once the market saturates, what then? I suspect the announcement of the Legacy version has taken a toll on orders for the FlyerChief version.
MTH, well what can I say... 5 years since the last catalog, 2 years since the last "new" product (the piggy back flat cars.) They had a product with a built-in good reputation and have squandered it.
American Models isn't a ball of fire for new products, but has been consistent. What appears to hold them back is the pure "conventionality" of the product line: no command control, (although I understand they will add a DCC plug for a cost) and a ho-hum AC sound system. In their favor is a bullet-proof product line with parts availability if needed.
Well, I guess I've rambled on enough this morning. Time for my second first cup of coffee...
Rusty
