Expanding on what
@Sheogorath said, there is evidently an important strategy that can be taken: Getting your domains on the Afternic's Premium Network - which exposes your domains to "
75 million monthly search queries from the largest domain reseller network in the world" compared with "35 million" in the Standard Network.
Here are more details from their FAQ page:
"Premium Network vs. Standard Network
Domain names are seen by 35 million searches by prospective buyers each month through the Standard Network. They also receive dedicated sales support, and use our transaction service to transfer from seller to buyer.
The Premium Network differs from the Standard Network two important ways. First, the resellers promote the domain name with their buy now price for immediate purchase, without counteroffers from the seller or bidding at auction. Second, fast-transfer domains are transferred to the buyer immediately.
Making your domain a fast-transfer domain gives you the highest level of exposure--75 million searches by prospective buyers each month at the highest average sales prices. Fast-transfer domains must have a buy now price and be registered through GoDaddy, DynaDot, DomainDiscover, TierraNet, Network Solutions, Register.com, Register.com Global Partnership Group, eNom, eNomCentral, BulkRegister, Name.com, Hover, EuroDNS, DomainMonster.com, 123 Reg, DomainBox, Heart Internet, Regtons, MyDomain, Domain.com, Dotster, Namesilo, Hexonet, NamePal, Epik, Rebel.com, or Internet.bs."
This is a pretty significant difference - if your domain is registered at one of these registrars, then after you list them on Afternic with BIN (and follow the emails from your registrar to enable fast transfer) you get a much bigger exposure. So, other than hoping that someone will type your domain in the URL bar, or doing outbound marketing, or making time-consuming sales-posts on NP and elsewhere, a good action to take is to get your domains listed on as many registrars as possible.
I for example, after reading that, made adjustments and actually moved some of my domains from a registrar that is not on that list to registrars that are. The Afternic system isn't perfect (and GD even terminated fast transfers with one of the listed registrars that are listed there due to politics), but it's still a powerful tool. I'm also in the process of adding mine to Sedo (keeping the DNS pointing to DAN landings presently) as they claim to have an even larger network of registrar (600+. Input on that from someone would be great).
Once one's good domains show up in many registrars, with a clear BIN (of over $200 according the the previous commenters here, but not overpriced), it's just a matter of waiting-time until you wake up in the morning to a nice "someone bought your domain" email