The WORST thing you can do for long-term DVC members/contributors is not reward for existing holding. You would essentially be saying "So you contributed to DVC? Cool. You held your coins instead of dumping them because you believed in the project? Well, you should have just tanked it with the others because now you get nothing at all! Oh, by the way, interested in joining us on a new project?" Anyone that did this would end up with no reason NOT to continually dump at that point, because you'd be showing that it's the "right" thing to do.