If you already have a Gamer Launch account connect your Facebook account on your user profile first before using Facebook connect to login. Otherwise you may end up with a new account.
Interested in the prices of WoW tokens over time? Here's two sites that track them:
WowTokenPrices (Ad-blocker friendly; only has 30 days of data)
WoWTokenInfo (Requires ad-blocker white listing; has data from the beginning of WoW tokens.)
Don't go back to when tokens were first offered 'cause the low price will make you weep for those days.