I have activated Wordpress Multisite and allowed users to sign up and create their own site. Although they are editing the main site directly and not through their own. In fact their sub domain does not show in the URL when they are logged in. FYI, I have created a test user account and this is how I know this.
The process I used to create my site is the following:
1. Setup FlexMarket Theme.
2. Created Multisite Network
a. Pasted the proper code into WP-Config and ahtmlacess files.
3. Used adminimize plugin to control user access.
4. Used Ultimate Branding plugin to control user access.
5. Used default user plugin to set default contributor setting to all user accounts so they can upload products to sell.
Even with the atempt to block the users from access to the main site they are not able to upload from their own site at all.
Please take a look for me. I have granted access to my Dev-Support. Please let me know what I have to do to get my users to upload products from their site and not directly through the main site.