Buying Tethering does not increase your "unlimited" data plan past the "unlimited 5gb limit". So you are getting the same amount of bandwidth. what difference does it make what is using that bandwidth.
I know why they want to charge for it, but for the consumer it makes no sense that they charge for it.
From what I understand the 5GB limit only applies to tethering itself. There is a separate meter for the unlimited data plan on your phone itself that is actually unlimited.
Usually the phone plan is "Domestic Data" while tethering is a different counter all together.
Edit: Here is a thread that sort of explains it.
http://businessforums.verizon.net/t.../Went-over-5-gb-Help/m-p/62699/highlight/true
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