What do the high profile sites sell for? 10x monthly revenue or more than that?
As someone who visits infrequently I've only seen 10x monthlies which seems ridiculous for a high profile site.
I would define a high profile site as any with a long existence, tons of traffice - but still off the radar, & consistent revenue... or some super flash in the pan breakthrough site like twitter (new & no rev).
sedo.com. they'll pay you the ad revenue your site gets if you park it and point it to their servers while you have it for sale with them. you can either auction off the domain or just list it for sale and accept offers through them. they do take 10% of the final sale price, though.