Because we wont find it either in the top ten 2010, 2009, 2008 etc global brands!
Now if you try to find the correct list you will see that Rolex always navigated in the top ten of the list where it belongs (Is Rolex competiting against Gillette or Google
Finally (and personally) I dont have to reach page 51 of Manfredi Ricca's (??) blabla report to check Rolex health I just take the test market (the USA)yearly results and see that Rolex still is in first position since a zillion years in front of Omega with a market share increasing in favor of Rolex.
Datas no blablas!