[sedo.com...]
Offers insights into prices, volume, .Com vs. ccTLD sales and more.
It's a quick read since the ratio of charts or graphs to verbiage is high, i.e., lots of graphical data.
Given the total sales volume and the 11,500,000 domains listed it appears the turnover is about .33% or 1/3 of 1 percent OR 1 in about 300 domains in inventory selling.
1 in 300 selling suggests that speculators need to be a bit more discriminating IF they are registering domains for resale. Also might mean many are not "right pricing" their inventory.
.Com is still dominant. .DE and .CO.UK are still the prime ccTLD contenders.