This single-item subscription business model has really been taking off lately, so I'd really encourage people who can carve out their own unique niche to try it. i.e. Ask yourself what niche market you could possibly service with a well-designed subscription-based service. So maybe it's just me, but these one-item subscription services really seem to be popping up everywhere lately...<p>Blacksocks.com was one of the originals and has been doing this for a decade, Netflix does it for movies, there's ShoeDazzle that girls use for shoes, InkFlip for ink cartridges, and Manpacks proves it again with a great execution (and that list goes on). To be honest I feel like this is a guaranteed win if you find a good niche that you know well and (of course) can execute well.