I think it all depends on the person. I did a 3 month sub back in November just because of the gild rolls. When I TR, I can eat stones ad get to 3. This is a personal preference, but it is the main reason I resubbed.
If the next "free gift" is irrelevant to me, I wont resub. Not that $10/month is a big deal, it is the only thing that is a BIG perk worth paying for.