Originally posted by IchabodCrane
Yes, most photography products decline in price after introduction. What you're describing with the Nikon exampes, though, are reductions associated with products which are or will shortly be discontinued. That's a different situation than introducing a product at an artificially inflated price to snare some "got to have it NOW" customers. As has been mentioned, the inflated price strategy runs the risk of attracting negative views of a product that may take a long time to eliminate (if ever).
For sure lenses don't follow this model. A given lense model under Pentax seems more to be there for 5-10 years, sometime even more (there still some FA one can buy) than 1-3 years of camera bodies.