The phrase "interesting proposition" means an idea or offer that catches your attention and makes you curious or interested. It's something worth considering or exploring further. Full definition
That makes it a lot more interesting proposition for a developer to make a camera - only game now. (blog.us.playstation.com)
Here the ecosystem is everything you run on the desktop, which poses a very interesting proposition for productivity and business apps alike. (techspot.com)
That, of course, makes it a very interesting proposition. (macnn.com)