Why does Earthlink still send me mail?

About four years ago, I upgraded my internet connection from Earthlink DSL (768 Kbps) to Comcast Cable (6.0 Mbps) . Since then, every month or two, I receive mail from Earthlink asking me to come back.

While I appreciate that Earthlink might not know what kind of service I switched to, I still have to ask why they spend money trying to get me back. Unless they think that I switched to dial-up, how can they even try to compete for my business?

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