Whoever is paying that much probably doesn't do his/her research or have access to some providers.
I pay $35/mo to T-Mobile. 5 GB at high speed per month. Unlimited everything else.
Seems their minimum is now $40/mo, but it goes down to $35/mo if you have two lines.
I'm sure some MVNOs are a lot cheaper, and I'm all for it. But complaining that the alternative is $90/mo is hard to swallow.