I think one viable concept would be if- in the DLC that comes out after TTK- Bungie enabled anyone who paid for the game, TDB and HoW when they were all at the original prices (whether by bundle or individually) to access a "secret room/boss fight" in whatever the main content would be (raid, arena, etc). Nothing offered would be outrageously OP, but it should be worthwhile (good quality weapons/armor that don't raise arguments that they're unfair). I don't know, just kind of snowballing. Let me know what you guys think and how you would make this idea into content!