This is just my opinion, but if something is old enough, popular enough, and still maintained well. Then I believe such authors should be allowed to keep their original prices and/or follow the rules in which the put the resource up under. To me, it would be a breach in trust if I put up a resource under a specific set of guidelines to only be hit by a moderator years down the road because of some change to the original agreement. Even if Spigot reserves the right to change its rules at any time. So I have no gripes with spigot for allowing some plugins to have "special treatment". Maybe I'm wrong. I don't know.