I don't have a level 80 character in that realm, yes, that's just what I heard in forums in various threads. Despite my own lack of experience there, just because a few (or few dozen) people don't like the system, it means nothing because there are thousands of players on this realm.
It's been discussed long ago here:
http://forum.warmane.com/showthread.php?t=395828
With all due respect, Warmane does not care what do you consider Icecrown to be.
If we lived in a perfect world where both factions of Lordaeron don't have any queues and can play with each other in harmony, nobody would include it in a crossrealm. However, it's not a perfect world and there is a reason for it.
Your realm has 100% full access to every single item for free. How other players got the same items should not concern you - YOU can get everything for free, just like you could in Blizzard. Why does it matter to you whether you get raped by 6.5k donor, or by 6.5k player who got the items the hard way? The end result for you is the same. If the only issue is that there are too many of BiS people and if you didn't have crossrealm you would simply see LESS BiS people, after several years you would still run into the same issue because players on Lordaeron are filling with bis people as well - by the day.