No, World of Tanks has 40 million accounts. All you need is more than one email address (which are also free), and you can make multiple accounts. You're still only one user. Not every 360 owner bought Skyrim. Same for PS3. Same for PC.
Also, if free to play is so much more profitable, then how is a subscription (which must be less profitable) being greedy? The hole in that logic is big enough to drive a world of tanks through.