This looks like their last line of attack they created https://www.gilletteshaveclub.com (Whois shows this site was created 23rd April 2015).
Mach3 Turbo: $3.50/blade ($2.09 on Amazon S&S).
Fusion: $4.50/blade ($3.17 on Amazon S&S).
ProGlide: $4.90/blade ($2.61 on Amazon S&S).
And since I am comparing it to Amazon's Subscribe & Save, both include delivery and the same level of convenience.
Name brand, 2 blade disposables are a about $1.25/unit on Amazon.
You pay more for the gel strip, and comfort of excess blades. Safety razors are a legitimate alternative to cartridges, disposables are generally terrible compared to either one.
Maintenance can be cut down a sub-minute per use by ignoring the folklore and cutting a few corners (I use a stone once a month for a few seconds (not considered normal) and only strop half a dozen times before each use).
This seems to be one of those curious cases where (at least in Europe and North America!) almost everyone either owns an electric shaver or buys expensive multi-blade cartridges, and has done so for decades. But over time the value added by those cartridges — safety from children's fingers? Certainly not a closer shave — was nullified and actually made negative by their cost. Meanwhile I shave for €5 a year with safety razors.
Is the marketing of cartridges such a strong agent here that the seemingly superior solution is largely ignored? Or am I not seeing the appeal of a Gillette nine-blade turbo-smooth aloë-vera-coated hyper-cartridge?
I sometimes wonder if this phenomenon is limited to the West, and that the rest of the world happily shaves with cheap safety blades or straight edge razors.