Not really. If you are talking about the cheaper lenses especially those with lesser features such as no focus motor, no IS/VR etc., it may make sense as these are less prone to breaking down due to the simpler design. I have two Nikon lenses both priced at a little of $100 both of which are grey market versions. Since they both do not have VR and don't have a focus motor, I am convinced that these lenses won't breakdown easily and still has a one year warranty. In my case I have just foregone the 5-year Nikon warranty. Howeverm if I were to purchase a much more expensive lens say a 70-300mm AF-S VR, then I would think otherwise.