Keeping with the marketplace theme, here is something I've noticed lately... A lot of people with joined dates of 2012 but have no posts (or less than 5-10) trying to buy stuff in the marketplace.
I have no problem with new members or who you do business with, but a new member who joins simply to use the marketplace without any form of contribution, is frankly insulting and annoying.
Personally, I'm going to buy from or sell to an established member who makes an attempt to contribute, not someone who simply wants to buy something cheap. As others have said, this is not Craigslist, or eBay or some other auction site.
... Just a thought...