And to get back to the original point of the thread, yes, there are a lot of poseurs who wear Rolexes out there and think their 20 year old two-tone Date Just is worth more than current retail. Craigslist is a battle zone. It really is a good idea to buy a first Rolex from an authorized dealer. But if you want to buy used, check out two sites. The first is Timezone.com. Go to the Sales Corner for used watches of all types under $5,000. Go to TZ Showcase for watches over $5,000. They have nice brand forums for all major brands, too.
TimeZone: Sales Corner
For a smaller but gentler Rolex-only site, try The Ultimate Rolex Forum (TURF).
TURF - Powered by vBulletin
Good guys hang out there. A few of them even drive air cooled Porsches.