7 classes 6 character slots

Since we now have 7 classes, doesnt it make sense that we have 7 character slots? Unless Im missing something, and its a new marketing strategy, come try our MMORPG, you cant play all the classes, but its fun!
This is the only MMO on the market that wont let you have enough character slots to be able to play all the game's content. Is it possible to get a refund for a character slot I bought, and cant use?