Greg,
We did a fair bit of research when originally setting the margin for selling products in the Marketplace. If you look at other online resellers you see a margin of anywhere between about 15% to 40% depending on the services being offered. Like every other business, both the Marketplace and SnowCovered have to set their prices based on how much it costs to provide the service.
As I pointed out earlier, I think that the problem in the DNN community is that we have only catered to the DIY and small site developers. We are missing huge market segments, that quite honestly are much more profitable. It is much easier to offer products targeted at the SMB market if you have some larger profits being generated from higher end products. This year I saw AspDotnetStorefront jump into the DNN market with a relatively expensive product. Without getting into details, I know that the sales figures for that one product are huge. Not because I think the product is the best ecommerce package ever written - it's not, but because it serves a large untapped market segment which will not trust their businesses to an innexpensive product. When people are building key parts of their business around a product, they are willing to spend a significant amount of money to ensure that their business succeeds.
Josh Koppelman, from First Round Capital, discusses this in his blog on the Anti-Penny Gap. When people are placing the security of their company in the hands of your product, then they are willing to pay premium prices to minimize their risk. Products like ecommerce packages, forums, and CRM are just a few examples of products which play a pivotal role in many businesses. As such, all other things being equal, people assume that underpriced products represent a larger risk. Whether it is risk caused by poor product support, poor documentation or even the inability to make much needed product enhancements in a timely manner.
Also, I agree with Jeff that Social Networking is not a fad that is going to go away. Social Networking is moving into the enterprise in a big way and you will see more and more vendors targeting this market in 2008 and 2009. Many of the current social networking sites show just a single aspect of what truly defines social networking. Where you will see big gains is in vendors offering comprehensive suites that allow people to build relationships between other users and to link data together in new and useful ways. It is about breaking down barriers to communication and making data more accessible throughout the enterprise. Large organizations are rife with problems created because "the left hand doesn't know what the right hand is doing". When you provide tools that allow the various parts of your organization to develop new communication patterns that are more organic and less autocratic, then you increase the flow of knowlege within the organization. There is a huge amount of data locked in word documents and powerpoints, blogs, forums, and numerous other data silos. Social Networking is about removing the silos from both the personal interactions as well as the data interactions. Tag clouds and similar technology allow me to find relevant information, whether it is sitting in a word document in HR or is in a forum post in QA or is posted in a blog by some manager. This is but one example of how businesses are finding value in social networking and why I don't think you will see it go away anytime in the near future.