Look at it like this Kuragari, I essentially compared it to buying the 1600 points at retail price of $21.19 (after tax) in KY where I'm from. My total order cost from Amazon was $26.76, which means I essentially paid $5.57 for 3 months of Xbox Live (about $1.86 a month).
The reason I make that comparison, I would have never bought the 1600 point card for $17.99 without this bundled deal for one reason, it was under $25 thus I would pay more in total cost by adding shipping rather than going and picking it up at a local GameStop or Wal-Mart.
Granted, had I known that you could have bundled two 1600 point cards together at the time, I would have much rather preferred that (being that it's to late for me to cancel). I hands down agree that is the best overall deal.