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I recently discovered that eBay UK provides business contact details on listings, so it's a simple matter to search listings for almost any criteria and then scrape the contacts (I wrote a short iMacros script just to do this.)
The question is - how would you use this? Anyone got any ideas about how to monetize?

one idea would be to bombard them with deals of the day - with your affiliate link.

Or find similar product and resell it to them.

Offer them discount coupon codes.

Or attach it with deals site of your own.