If you know exactly what you want, you can often find something as a demo or a clearance from the dealers that actively sell online for 60-80% of MSRP. Some of my best purchases were exactly that - peace of mind, confident of what I was getting, etc.
Ultimately, the individual selling a piece of gear has to inhabit the price points below that or it's not compelling, leaving the 50% of MSRP price (give or take) as the natural target. If you have something almost brand new, where the model is still hot off the press and the great reviews are just coming out, you can get above that level, but for the typical sale there's just not enough to justify going much above that pricing point. -Kirk