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If you buy keyword specific domains, you're really buying the type in traffic.  I use the URL builder and redirect through that URL so you can see how much traffic your getting from the keyword domain.  There seems to be no rythme or reason to what keyword domains deliver traffic and what don't.  By tracking traffic with the Google URL builder you get a feel for what names are giving you traffic and which are not. ie. the plural, the singular, two words, three words, the possessive, etc.
1. Some domain names don’t go to auction and are instead held by the registrar in their own portfolios (you called this “warehousing” by the registrar). This is probably less than 0.001% of the domain names….actually, probably even less. I suspect it would only be premium domain names with massive exact match local search quantities. Not surprisingly, I cannot find any information from registrars about their procedure, quantities of domains their keep, or ICANN’s rules (if any) about this.
Okay. So, let's move on to our next tab crawl from search query, something look at the settings. So if you want to limit the amount of results that you cruel per search query, you can tick that and specify, so if you only want to crawl the top three or ten results from each search query, you can enter that there. He'll just go to the end of the search. Next setting, results on Google skip the domain if it's in the majestic million, so the majestic million is just something from majestic, it's a free resource that majestic SEO makes available that shows the most popular hundred domains.
Thousands of domain names expire every day. The reasons are different. Some owners forgot to renew the domains, some just don't want them anymore or they moved on to other projects. For most people these so called Expired Domains don't have any value. They just see a bunch of Domain Names someone else deleted and move on, but for the people who know about SEO or the value of good Backlinks, Expired Domain Names are money just waiting to get picked up from the street. The only problem is to separate the good ones from the bad ones. That is where ExpiredDomains.net comes into play.