The reason I don't use this is because the "stream" of blades isn't saving me any money, it's costing me more than what a trip to Walmart or Costco will cost (in Canada, at least). For me, this is entirely a cost-based decision. I don't see blades being delivered on a continual basis as a benefit, just puts more pressure on me to use up my existing blades fast (and that's weird).

To each his own, I think this is the ultimate lazy man's service. Get your ass out to the store and when you're back, mow the lawn.