i have to agree with GoPC partly on his definition of an active broker. but, monte was right per his argument that, moniker secures the buyer one of the highest sale pricing in the industry. this is what after all, a designated broker should do too.
i am however, skeptical of other so called self proclaimed brokers, who do nothing but park your domains and take a cut of your revenue via ppc and domain sale for playing no active role of securing a buyer on your behalf.
one can always park domains on their own servers, like I do. But, if you have a very good domain, it won't hurt to use services of moniker. their good knowledge in this business can mean the difference between 1k and 10.
i pity those guys, who sell good domains today, on current traffic levels, based on a few months traffic multiple. What a waste? This is a negotiating tactic used by buyers to mark prices down. can you tell if today's traffic waves could be tomorrow's endless tsunami?
there isn't one best way to sell your domains. You must know your target market, other than sharks, who may want your domains based on traffic alone. you must try all avenues and all legal methods.
i am not sure how good your names are. But, one of my friends used a wall street journal ad to sell a bunch of his domains. It was targeted for the business community. It worked for him.
other places are - ebay, dnforum ofcourse, ********, using your own servers (redirects), being your own broker (create a website for your domains), offering a commission to someone for finding a buyer, ask your attorney (if you have one). if you have legal or financial domains, they have a lot of contacts.
Just my 7 cents. An extra nickel worth of opinion doesn't hurt.