How to show ads when you are not hosting a site

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This web hosting review was started by hostcontact on 2009-11-06 11:45:07:

I own a few domains without websites; is it a good idea to show ads on them; do people actually earn anything by displaying ads on empty domains; my current hosting plan doesn’t have quota for additional domains so how do I do that without buying a hosting.

Is there any other LEGAL, APPROPRIATE way to earn from empty domains.

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