Great question. You and I sound alike in this respect. I created a quick-and-dirty marketplace for my own portfolio (
https://clearance.domains) but it does not get much traffic. I have also tried these:
- Dan.com (now part of GoDaddy)
- NameLiquidate.com (part of Epik)
- Sedo.com
- Have converted a few to stand-alone, no-maintenance sites using newsy.co (if you are open to referral links: https://www.newsy.co?r=newsyco-1000) and really dig it. But sadly, I'm pretty much convinced that trying to build any meaningful revenue solely from PPC ads is no longer a viable model.
If you find something that works for you, please let us know here.