Randy, I can see why some of your engines get to the price they do with the level of detail you add.
Larry, I accumulated a lot of engines when I first got in model railroading as an adult but with a fairly limited income. Once I detailed a few of my engines, the other ones started to look pretty clunky. I ended up selling about 45 of them to get the money for a good compressor and air brush and to finance detail parts and decals. I went from about 65 engines to 20 but the ones I had left I had a lot of fun painting, detailing, and decaling. I learned a lot and had a much more satisfying roster, even if smaller. I think you'll find yourself headed in the same direction.