Just butting in to say that I like the "Garage Sale" thread idea. Having a place to post domains you are ready to drop will be great for bargain hunters and put a little cash back in the seller's pocket. A lot of people like finding aged domains that have potential (to them), this would be a fantastic way to benefit the seller & buyer.
When considering the number of domains being dropped, pricing them at 25-50% of the reg fees would trigger fast sales and could be enough to finance the renewal your remaining portfolio.
i am sure software wont be of much help as people might then drop good generic names that might not fit in the software formula. its just like saying how do you determine the value of a domain? using en estibot or another appraisal software?
Ah, but the tool could help the decision making process as a tool should. I see the idea as being a quick or automated way to review your domain inventory so you can plan your renewal strategy instead of being forced into last minute decisions.
Think of it as a "Renewal Forecasting" tool. After all, for many folks, we are talking about a significant annual investment in domain renewals. Looking at a report 30-90 days before a renewal deadline would be a quick way to help with the decision making process.
An example of this would be:
Launch the tool to see a 60 day report that shows 200 domains are up for renewal.
You decide to renew 150 of them because (according to the report) they are proving to either be profitable or are covering the renewal and/or hosting expense. (yes, even if you have super cheap reseller hosting or your own servers, each developed domain should be allocated part of the expense in order to properly calculate the cost of ownership)
20 don't cover their expenses but receive enough traffic to consider improving development or selling at a respectable price. This would result in immediate plans for posting them for sale or scheduling a development process.
That leaves 30 requiring a "gut feel" decision and you have plenty of time to decide what to do about them (improve development or post for sale)
This is a much better process than trying to make a decision on all 200 the week before the renewal date. The situation is even more hectic if you have 1000+ renewing within a 30 day period.