Question regarding paid themes

Hello,

I had a question regarding paid themes.

I own a remotely hosted forum service that is powered with MyBB. The basic setup is all forums run off one set of MyBB files. Forum admins don't have access to the files at all, only me. They won't have access to the XML file, all they do is click an install theme button and it gets added to their forum.

Would I be allowed to buy a few themes from Myskins and have them as an option on their forum?