Can Pro Sites subscribers get Marketpress on their blogsite?

Hello,

I just have a quick question about the Pro Sites plugin. I am thinking of developing a site similar to etsy or ebay where people could sign up for an account and develop a blog and landing page for their business (i.e. http://www.example.com/user1). Would it be possible to allow subscribers to incorporate a shopping cart like Marketpress into their individual blog pages so visitors could purchase items from their blog?

Thanks and have a good day.