You can literally buy the 2 month card and add it to your account and just stack it. 2 months, 6 months? You're in it for 8 total anyways. Why not buy it!

Also, to be fair--you're rewarded for your loyalty by paying less per month when you buy a 6 month chunk. So there's no slap in the face. You CAN get your cake and eat it too. Just buy the game cards and add them to your account