I guess for the record I don't pay for tethering and it's unlimited. I use mywi.
And on the iPad I plan to only pay for Verizon when I need it. I did activate it the first month to see how it was, but after that expires I won't flip it on until I need it. That is one of the points of the iPads data right? Use it when you need it. I may only need it 3-5 times a year.