I really like the way the ec production for 7 ddays thing has gone so far and I see it as a great way to remove some of these ddays from the game. Also seeing that Aoen is buying them from the players that really tells me there is too many in the game, so instead of having an admin buy them to remove them from the game why not have another sink hole.
My idea is that for the same 7 ddays you could get 1 week of having your server scans and capacity scout spam ops time for refilling be reduced in half.(ie Server scans would gain 10 every 3 hours instead of 6 and Spam ops would gain every 2 hours instead of 4)
I think this would be something that would interest a lot of players into using their hoarded ddays on it. Also it would put more ddays on the market for those that want to do it but don't have the extra ecs to keep it actively halved in time.