I agree to some degree about the fit as I stated in my earlier post in this thread it was not a perfect fit but not quite as bad as your suggesting. Unless Nikon stops changing the body design of there cameras with each new model the after market suppliers will not provide products.
Recently I contacted both Really Right Stuff and Kirk about an L-bracket for the D5000. I was told that they don't have enough market to design custom parts for the lower end Nikon products. Eventually RSS came through and now has an L-bracket but initially they had serious concerns of selling enough product to break even.