How is a Core Developer defined in this case ?
Thats pretty easy: All persons who have write access to the Plone - repository **AND** have contributed significant work to Plones codebase within the last 12 months, which means from June 2003 on are treated as Core Developers. This does not cover the Collective.
So be honest when you ask yourself about your role. The special lower rate we grant to this people has the reason, that people who are activly working on Plone, should be supported.
We know there are a lot of people who got write acccess to the repository because they participated once a time a sprint and have been never seen again or never used it really. So we trust in you and your fairness against the *real* Plone contributors by offering this special discount.