Having to pay twice for the same data plan with just another capability is pretty outrageous to me. I can understand VZW doing it, but it's criminal in my book. Already pay for it on my phone, why do I have to pay more to use my phone's full capabilities?
That being said, many will disagree with me, but that's just how I feel. The only way I'd consider paying for a tethering plan is if somehow it miraculously gives me 4g speeds on my other device for some reason.