I think auction prices have risen.
Great thanks for agreeing that values have risen (I know you couldn't quite bring yourself to say it but that's what you mean, right?)
Lets take your example 179 domains, auctioned once in say 2009 for $4404 & $14677 two years later.
By my calcs for a domainer to try and do that there would be 179 x 50 = $8950 in cor fees + $3580 in renewals + selling commissions. So even if a domainer could buy into the drop market and sell into an efficient selling market (which does not exist for domainers), the result of that data would be a substantial loss.
Whilst those sales results just show the market growing (well booming actually), everybody understands that there's a lot more to making money that just throwing money at a booming market. All markets have their fluctuations, time requirements, holding costs, administration etc.
However, I will have to comment on your figures as you've gotten a few things wrong.
COR costs $18.50 at NF or $20 at VIP or Drop. I don't think any domainers pays anything like $50 anymore. So the first figure should be 179 x $20 = $3,580. Then there's the fact that this data was over 2 years not 4 years so renewal costs are not necessarily required. Let's split the difference and assume that 50% were sold just before 2 years and 50% just after so thats 90 x $20 = $1,800.
But although you were about $7,000 out in your maths, I'm sure we all take your point that even though values are booming it doesn't equate to an automatic profit for the domainers. Just like people lose money on real estate or shares in a growing market.
Billy01 seemed to suggest that ranking changes could make domains less valuable but didn't explain why in the end.i'm not sure why this conversation is in the SEO area ?