I feel that people in beta who are used to playing not the first quest (which is a small part of the game) but the game mechanics in general can just run through the beginning content with no learning curve on how to use the systems and UI in the game will be at an unfair advantage for the first few days of release.
-Advantage to those people who want to hit max level first
-Advantage for those people who place items on GAH or RMAH the first few days
Considering when a new expansion came out in wow, items such as herbs and pre max level blues were going for 10x the price they are going for after the first week of release.
-There are people smart enough to not buy these over priced items, but there are a bunch who will.