Support.
I came back to realism about two months ago, and while it is nice to not be able to buy 99s there are times where I don't play for a couple days and the exact same "recent" items are on the tp. To the comment that classic is only slightly higher xp than realism I think this is incorrect. Like Lunchy said about the well, votebooks, etc, the max bonus you can get on realism is like 3.6x. Classic on the other hand is like 10x. Now, when it comes to ironmen, I have a pretty good idea of the xp rates, but that's like saying EIM vs Post 99 ironman are about the same.