Started looking into subscribing to Verizon using a CableCARD-based tuner, since I don't actually own a TV.
I did some research at verizon.com and ran across this page (important parts in bold):
CableCARDS
A CableCARD is a device that provides access to certain encrypted High Definition (HD) and Standard Definition (SD) digital programs without the need for a Set-Top Box.
CableCARD Features and Services
What digital programs can I watch with my CableCARD?
You can view all FiOS TV Standard Definition and High Definition digital channels to which you subscribe. You can also order certain Pay-Per-View events by calling 1-800-VERIZON (1-800-837-4966). Without a Set-Top Box, you do not have access to On Demand programming, the FiOS TV Interactive Media Guide, or other advanced features of the FiOS TV service.
So far, so good. I logged into my account, selected a package, and started the checkout process - and then encountered an odd question: "How many set-top boxes do you need?", where the options were a drop-down list starting with 1 and scaling up. There's an extra $12/month charge (plus taxes, of course) for just one box, and more for other boxes. No way to skip that step.
So apparently, according to Verizon's service rep... I need to pay $12/mo+tax for a set-top box that I don't need, and that will sit on a shelf while I watch Verizon TV through my fully-supported CableCARD adapter.