Just wanted to give everyone a quick comparison of the visibility that a premium domain gets on various auction platforms. I am using the premium domain name that I am in the process of selling (or developing, whichever comes first), Links.com.
1) Flippa: Excellent visibility. I am using their basic auction placement that costs $20. I didn't wish to pay the price for a Premium placement (which is something I may consider in the future) nor did I use their Feature placement. After 5 days, the placement has received several hundreds of views and many members watching it. The quality of visibility is also high. I received a call from a top tier broker within hours of the placement. For $20, I consider this Excellent visibility.
2) Sedo: A free basic placement will usually bring a few dozen fews per month. A feature placement for $49 will bring about 5 times more views and some high quality contacts. The actual bidding on the site is substantially less than Flippa. Overall, I rate this site as good.
3) Afternic: For some reason the views on this site is very low. Maybe it would be better if I work more with the system and try to understand it better, but the rules are complicated and I don't want to take the chance that I set parameters incorrectly and create problems for myself. I do get email contacts from time to time asking me to set a Buy Now price which seems odd to me, since I have already indicated that the placement is a Make an Offer placement. A bit confusing and I rate this site as Fair.
4) NamePros High Value: This is a nice site considering that there is limited traffic. I get some interesting queries as well as some interesting unsolicited advice. Depending upon the domain name and the price you are looking for this can be a good resource. However, for this particular sale it has limited value. So I will rate it Fair for Super Premium domains but Good for those that are a notch below because the quality of viewers is quite good.
If anyone has different experiences, I would be interested in hearing them.