I've been meaning to do a Skirmish Day on my alts. Yeah, I need the Marks. That said, mobs in skirmishes don't drop anything but coin, as far as I can remember; excepting the LTs, Encounters and the Boss. Sometimes the Boss doesn't drop anything, only the chest. Sometimes the Boss drops something and there's no chest (T3 skraids, excepting ... should be a challenge chest in one form or fashion there).
"No sadder words of tongue or pen are the words: 'Might have been'." -- John Greenleaf Whittier
"Do or do not. There is no try." -- Yoda
On planet Earth, there is a try.
Indeed, in a world and life full of change, the only constant is human nature (A is A, after all :P).
We old vets need to keep in mind those who come after us.