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DRIt would be(come) beneficial and differentiated, if your service provided links to auctions AFTER they are removed from eBay and/or major auctions (since you mentioned two years in your post). You would win a customer (me) if you were willing to save this data on servers for multiple years or better yet indefinitely. This is the only way to track long term trends, pricing and owner data for rare cards / sets over an extended period of time. Striking deals is more important to me then 6 months of pricing data. Simply using Google, I am acquire at minimum 3 months and many times years worth of the same data (sometimes cached) albeit not in a concise manner. Have you considered this???