No, it's a waste of money. I don't need to justify my reasoning for going tiered to anyone, especially myself!. The numbers speak for themselves... Why would I continue to over pay for something I don't use? Like it or not, you ARE paying a $22.50/mo. PREMIUM to keep your unlimited data. You paid full price for your phone.
Hey, if going tiered is a better deal for you - do it and screw anyone who tells you otherwise. Cause what matters here is saving money and each user will have different usage and different reasons to go with one plan or another.
My usage and reason for keeping:
For me it looks to be 18.75 extra a month for 24 months if I pay full price ($450 extra over subsidized). Tack on the $30/mo extra I pay for tethering and you get another $720 for 2 years... total of $1170 that I paid specifically to tether over the two years.
Now consider I stopped paying for home internet - LTE is faster than what I got for $60/mo or $1440 for 2 years. Add in what I paid for the phone and tethering and I get a savings of $270 over two years. This is not including what I paid previously for traveling data.
With the hotspot I used to have, I paid $80/mo for unlimited 3G. Over two years I'd have paid $1920 for unlimited 3G. This is pure savings now.
My contract is good until the end of June next year. So I get a guaranteed 9 months of unlimited - after which who knows. So $540 in home internet saved ($60*9), $720 in mobile internet saved ($80*9), $270 spent on tethering (9*30) and the $450 for the phone.
Worst case, I save $540 if they cancel unlimited after my contract.
Best case, I save $2190 over two years if they don't.
Either way, I save.