Chalnoth said:
Except hyping an upcoming product can reduce sales of current products in the interim.
Unless your new product is imminent and you want to start getting the word around. We've already seen price drops on older products to clear out inventory, so any such problem is already being minimised.
Nvidia has already been doing pre-release hype for NV40 for the last few weeks - they don't seem to be worried about losing sales just before a new product, and the NV3x products have had a much shorter lifespan at lower profit margins than R3x0.