as a 450D user I'm on the hunt for a good deal on a 5d2 or save for 6D or 5d3
however I always see people selling bodies with 5-25K clicks attempting to sell the 5d2 for 1500 or even more, because they spent 2 grand on it a year ago.
I dont think I'd pay more than 1400 with body and kit lens. Is everyone crazy hoping we don't know what the market looks like or just hoping to find a sap.
The 24-105 doesn't command the sale price it used to, but it still can easily go for $800 used. So you are basically trying to get a 5d mkii in like new condition to good condition (and I believe the 5dmkii is graded for 500,000 to 750,000 shutter actuations which means it still has 97% of its lifespan left) for around $600.
I have seen a refurbished 5d mkii sell for 1400 plus tax at Canon... and I've seen the new 5d mkii body, plus a 24-105mm, plus a printer with a big rebate sell for 22 or 2300 at B&H.
As for the marketplace, ebay and Amazon marketplace generally set the market. And the cheapest body is still around $1400. $750 for the 24-105. So a best case scenario would be 2150 for used in very good condition.
For what it is worth, I buy and sell gear all the time. And generally if I want to make a quick sale, I set my Craigslist price at what the used price is at Amazon minus their 8% commission plus 20 or 30 bucks... because people like to haggle and I'll happily knock off that extra $20 so they feel like they are getting a deal.
So you talk about people not knowing the market... I suggest you do some market research.