I completely agree and get where you're coming from, however, many of the older pro lenses (like the 80-200mm f/2.8 that got replaced by the 70-200VR lenses), that are still just as fast and razor sharp as they ever were are often around the same price as buying the current version of off-brand lenses.
I compromised too. I mainly shoot a D300s, also a DX crop body, so instead of getting the 70-200VR2, I got the original 70-200VR, as it generally makes zero difference on a crop body.
I'm not suggesting people buy the latest and greatest most expensive everything, but spend wisely and do your research. Sometimes spending £400 instead of £800 on an off-brand lens looks like a good idea. Spending £400 on a lens to find out it's soft, has a lot of distortion and chromatic aberration only to sell it at a loss (assuming you can sell it at all) and then buy the £800 lens anyway isn't such a good idea.