Spikedo, the $60 fee at Afternic is not a flat fee. But I agree that Afternic does especially well for higher priced sales. This is what (I think) I know:
Both Afternic and Sedo have a 10% sales fee. Afternic has a minimum fee of $60, also when the domain is parked at Afternic. Sedo has no minimum fee for domains that are parked at Sedo, and a minimum fee of $50 (or Euros) for domains that are NOT parked there.
But here is what I like about Afternic:
They will return 25% of any sales commission fee if the buyer was referred to Afternic by you. Since my domains are all parked at Afternic, I automatically receive 25% of all commission fees for domains sold to buyers who are referred to Afternic by my parked domain.
I calculated that I have been receiving this 25% reduction on commission for roughly 2 out of 3 domains that I sold in the last two years. Because of this I've been paying an average of only 8,33% commission on my sales through Afternic.
To give you a sample of what this has meant for me, while comparing Afternic to Sedo:
Example 1: Selling price $400
-> Afternic commission: normally $60, but only $50 on average ($45 for 2 out of 3 domains)
-> Sedo commission: $40 (if domain is parked at Sedo)
Example 2: Selling price $2000
-> Afternic commission: normally $200, but only $166 on average
-> Sedo commission: $200
N.B. This is apart from the 25% referral income on commissions that I have received from buyers that I referred to Afternic through my parked domains, and who end up buying someone elseยดs domain.
As you can see it's not easy to compare the two, since the net effect depends in large part on the average sales price. But I hope this will at least give you an idea. And if you ยดplanยด on selling most of your domains at prices at or over $500 - I would definitely go for Afternic.