I can imagine partly for the reasons you just listed, larger established players will ultimately push the DSCs out of the market. Probably Amazon single handedly.
But that's a knock on me, not the subscription service. If I kept better track and knew for sure that I use 1/60th of a 12 ounce bottle of shampoo everyday, or whatever, then I'd be more inclined to subscribe to that once every two months.
Thanks.
You'll want to try a few different brands of blade with it, as there's no one "silver bullet" blade that works best for everybody. Lots of vendors sell sample packs on Amazon containing a few blades each from a bunch of different brands. Here's an example: https://www.amazon.com/Double-Edge-Razor-Blade-Sample/dp/B01...
If you want to really nerd out on this subject, the place to be is the Badger & Blade forums: https://www.badgerandblade.com/forum/
From a business standpoint it's a great strategy executed at the right time, even if it does feel icky.
Personally I use a stainless steel safety razor for $30 that will last forever, and blades that I got from Amazon at $12 for 100, each lasting about two weeks of every other day shaves as I have fine facial hair. DSC can't beat $12/year.