Paranoid I can't say I remember any MMO having an expansion that added a month to an existing account.
All of the DAoC expansions did and several of the early EQ ones did IIRC (I have no clue about the later ones).
Eve-Online typically releases its expansions for free... Honestly, this just feels like greed on Blizzard's part (more likely their parent company's influence... the old Blizzard would never pull this shit).
I eat pasta!