Personally, extra heads, be they 2k2, Filmation, mini-comics, cardback, vintage or something else entirely will never get me to purchase a second figure alone much less a second subscription. For me to want to double dip, there's gonna have to be way more than a second head. There's only one figure that has successfully caused me to purchase a double so far and that was Trap Jaw since he came with an extra arm and head to turn him into Kronis. I'll probably double dip for Marlena one day though that has to do more with wanting the different bios than wanting to display her both in Queen and Astronaut mode. Second heads have never been a deal breaker for me, I understand that for some people it is, for me, it's just an extra accessory that ends up in a box of spare parts that I pretty much never use.