Don't allow auction owner to delete member comments in his auctions. It should at least apply to certain auctions like domain sellings where experienced members are warning about fake domain PR's of fradulant sellers. Even if you allow them to delete the comment, at least people should see owner deleted XX comments in that auction.

I suggest that Sitepoint integrate an escrow service into the marketplace. Something like the way rentacoder has. For a Buyer, they would have to deposit funds before they could bid on any item. This requires alot of think, but it's just an idea that I think should be considered.

Every user watch porn/adult whenever he has time and i think sex is also a necessary part of our life like food, air and all. so i dont think there is any harm in allowing adult sites for buy/sell section. it will generate more business for all buyers/sellers + business for SP. (though i think they already have plenty of it. lol)

Allow searching by category, site name, allow sorting of search results by end time.

Marketplace 1.0 had a view counter associated with every listing. Users have asked to have this feature restored to Marketplace 2.0.

Many sites are sold based on Google AdSense income; however, it is difficult for buyers to verify claims made by sellers about the amount of income being generated through AdSense.

The Marketplace system should (with seller’s permission) reach into the seller’s AdSense account and pull out income information.

Sellers have reported that their auctions only seem to get noticed when they are first listed, because once they slip off the home page of the Marketplace they are much less visible.

By providing a list of auctions ending soon on the homepage, we can give prominence to auctions as they near their end.

Follow eBay's example. They list the current bid price and BIN price in the search results. For buyers, this would be very helpful in helping to narrow the results based on the price I am willing to spend.

Say someone helps you in one of the coding forums, you can reward them with some of those sweet sweet marketplace credits.

The marketplace gets to be very expensive for small business owners and I can not afford to utilize the services very often

Currently you must find a user’s profile page in order to see a list of listings they have created. A link to this page is not always easy to find. It would be better if we could just search by user name.

Then I can set my maximum bid price and go away and the Sitepoint system can keep raising the bid automatically as and when needed.

Right now there are a lot of auctions that have to be relisted because of deadbeat bidders who don't follow through. This wastes the time of the seller who is forced to relist and of other legitimate bidders who lose out on sites because someone outbids them and doesn't follow through. Let's go back to the old system and allow sellers to decide - it will work out best for everyone.

Calculate the trustworthiness of a user based on their feedback profile and past Marketplace activity and show that as an icon next to every username.

a way to get notified of new listings in categories of your choice ( maybe keyword related as well )

When a user creates a new auction, SitePoint should automatically grab unique/hits of the site, as well as PageRank, and Alexa, based on its independant source.

It would make it easier to find sites that are of interest if we could see the Monthly Revenue and Profit in the search listings. So if we are looking for sites with certain levels of revenue and profit, we can easily see it. I look at too many listings only to find that they are making no money or too little. It would be great to be able to sort the listings by these values as well.

The link in website listings should open in a new window / tab, helping everyone analyze the facts in the description. I always open the website link in a new window cause I like to compare what the seller says with the actual content in the website. Maybe others feel this way also.