I think this thesis can hold true in many verticals and is overall a solid argument. For example, a user might be okay with paying for premium features on a sit

I think this thesis can hold true in many verticals and is overall a solid argument. For example, a user might be okay with paying for premium features on a site like Vimeo, Behance, Elance, etc. when they wouldn't pay for similar features on a generic social network like Facebook or Twitter. You're paying for these premium features because the service provided is much more targeted (and provides more value for your time) or the community is more engaged in your media or conversation (and provides a richer experience).