I think a section for Commercial Modules would be a positive thing.

1) People get to see what else is available apart from the plugins section....it would be an outlet for the various developers here who provide a lot of free code and support.
2) Most important: people get to see how problematical a module is, and how responsive the developer is in dealing with it.

There are a few sites out there that offer stuff but the developers are unknown here, new users are flying blind as to what they are getting.

A commercial section would greatly help to sort out the wheat from the chaff. In my opinion.