And for extra cheapskate-ness you don't event get one extra GB when you do that. Pay more for less.
I didn't know watches were less. I can't find anything on Verizon's site (from a quick glance) that mentions them, only that "tablets and hotspots" are $10/mo.
Even at $60 I don't think I'd do it. I might for my iPad, but not my watch.