Nope, that's just for the privilege of using the system.
But smart stamps are lower priced than actual stamps, not quite sure exactly how much by, you'd probably have to print several hundred in a month to make up the subscription cost but I don't consider that a problem tbh.
I suppose if you consider that your monthly subscription is paying for the convenience, the superior presentation this system affords you and of course their upkeep of the system etc, it's not a huge price to pay.
If you're considering doing mail shots on a regular basis I can thoroughly recommend it
