Another option I haven't heard yet.
Try to rent them out, we have been offered 50 cents (about $0.20) per emailaddress.
If you have categorized them, they can be worth a lot more. So, can you make money with it, yes. At least 1% in dollars of the amount of address, I assume.
I might be wrong, as we have never sold them
(to answer your earlier question)
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Paulus...
Megageil.tv
NaughtyCelebs.co.uk