Paying enough for the phone and text plan as it is. Data should be unlimited and tethering a part of that. Monthly fee for my family plan which includes 2 droid 2s, 700 minutes, unlimited texting. Of which, we use probably about 40 minutes and about 400 texts per month, that's an incredibly liberal estimation too, it's probably way less for both. $200 a month seems rather high considering the usage of those services, which is the bulk of what the plan costs. Tethering free on what is currently an unlimited plan somewhat offsets that. I only rooted and tether one of the devices, mine. I only use the tether on the road for work because the sprint 3g/4g smartconnect card they gave me is about as good as what I clean up off the sidewalk after my dog. I don't use that much data either, I think the total tally for last month was about 4gb between both of us. Nowhere near the 80gb mentioned earlier in the thread. If someone travels that much or whatever, they should pay the 30 bucks for it. Well worth the cost and much cheaper than buying high-speed internet at home.
Once my job's contract with sprint runs dry, they are going to switch us to big red cards. That's the day I stop needing to tether. Til then, oh well.