Although in Beta, the marketplace has been open for about a month. The response has actually been quite good and has picked up even more steam since the announcement. I personally have sold a couple items through there itself. I am hoping that it continues to gain more traction as time goes on. I'm open to suggestions to make it easier to use, so please let me know if you have any.
FYI, yesterday I added an 'Extreme Cooling' section in the marketplace as well after some interest from the community.