Way to go, hope you still think its funny when they have to double/tripple the fee, or follow ATT and limit all data because of people like you.
I'm sorry but what are you talking about? This is not malicious. The phone is supposed to be connected to the Sprint network 100% of the time. That is how it works and there should be no expectation otherwise.
If you are using Wifi part of the time then you are not making full use of a service that you have already payed for!