These are usually "fake", and will show in the lack of proof of revenue. Selling price usually falls within a range which makes you recover your payment in 18 m

These are usually "fake", and will show in the lack of proof of revenue. Selling price usually falls within a range which makes you recover your payment in 18 months, if the seller does not set a minimum price around this range, it is just he wants to get rid of it for some reason (blocked by AdSense, blocked by Google, problems with Google search), or is just trying to get attention to the site to withdraw the sale if it does not get to something closer to this. Hope this helps :)