I monetize through Fabulous. I put some "for sale" signs on a few domains and the ppc conversions went way down. When people see a for sale sign, they seem to be less inclined to click on anything else on the page.
The one thing that did go up was the number of silly offers. I have a lot of one-word domains from 1996, and when the for sale signs went up I started getting lots of $10 offers... yeah right, $10 for a popular one-word .com. I wish Fabulous had a discreet for-sale sign.
Marc