Yeah I get that. Makes sense. Buy why complain about a fee? Its like saying, "hey, I bought this badass ferrari, but it doesn't get 40mpg? Wtf?" Even
Meh...Sprint has to pay for that 4G build out somehow, so I can understand. I can also understand the OP, given that I currently have both AT&T and T-Mo, and recently left Verizon. I too was surprised about the extra $10 for 4G access, when I'm getting similar speeds for the same $10. I'm not surprised about the inconsistent 4G experience for a given user...hope it gets better.
As far as the math, people have to do what's best financially, and from a service perspective. There will always be some that may not find value at certain price points, where others will. Like I said, I'd have a hard time paying $40/mo for 6 - 10Mbs on Sprint when I can get 7 - 21Mbs for $10 on T-Mo...however having the right device can help make that decision.