I was just going to post this in the "Deal of a lifetime" thread, but I see it's been locked. I read the thread yesterday on my phone and didn't feel like replying and figured I'd wait until I got home. Anyways, here is what I have to say.
While I don't remember what the OP of that thread bought, I just know it was a good deal. As you can tell, I am new here. Until I looked at the Marketplace on here, I'd have never guessed in a million years that the resale of photography gear is as high as it is. I would have been the guy selling my stuff super cheap. I've bought all of my gear brand new (minus the 50d), so I know what it originally cost me and how much I have into it. In my other hobby, racing motocross (was into car audio about 12 years ago), a person is doing really well if they sell used items for 60% of what they paid. 50% would be more like it in a lot of cases, and even less in others.
Just before I found this place and the marketplace, I had a Canon BG-E2N on Craigslist (mint) for $75, just hoping it'd be worth that. It was on there for a couple of weeks with no bites at all. I thought about dropping the price on it to see if that would help move it. Then I found POTN. I changed my ad, put $150 on it just for kicks. Bam, it sold 2 days later. No haggling on the price either. She met up with me, I put it on her camera for her, and she paid me $150 cash right there.
My first DSLR was a Canon 40d. Less than 4,000 clicks and I was hoping to get maybe $350-$400 for it, since it was so "old". I bought it in July of 2008.
My point is that there are stupid people like myself out there that don't know any better. Well, I'm not that stupid anymore, lol. Every time I go into the Marketplace on here, my jaw drops. I'm still in shock! I keep thinking "Maybe I can get some of my money out of this stuff after all".