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davidcyclebackIf you have good feedback and provide good images of the signatures and COA, eBay is a decent place to sell signatures. Most bidders like a clear look at the signature, either because they want to make their own opinion or because they like to know a seller is confident enough to provide a clear picture. Though, most eBay bidders will rely on the Spence COA as final word.
If you regularly sell autographs and do a good job (authenticity, reputable authenticators, service, etc), you will likely get return customers as many autograph collectors like to deal with sellers they've had good experiences with before. Particularly in the area of autographs, experienced collectors like to have a stable of reputable eBay autograph sellers.