I'm a member of an organization that has moved to having each person who submits a paper for presentation sign an agreement stating that if they are selected to present at the conference, they will do so in person barring some act of god style event, on penalty of being barred from any further dealings with the organization.

This was brought about purely from folks submitting papers to get something published in the conference proceedings and then promptly fucking off into the sunset without ever showing up to present.