Donít tell me you are promoting 10,000 products and that you need one page for each. Keep those pages for your customers, within your website, they donít need to be directly accessible by the whole world.
Oh yes I do need one page for each product. I have descriptions, specifications, options, etc. that all need to be presented to the visitor. How else would I present those pages?
And, without them being accessible, I lose out on all that page visibility and the opportunity for that page to pull it's weight in the overall scheme of things. Why would someone want to block access to those pages from a spider?