I'd love data services and hosted BES/MDS for free too, but it's unrealistic.
If your carrier's data fees are too high then you might want to check out other carriers.
Another option would be to purchase a different device. I'm not sure with Nextel, but most carriers offer gprs for cell phones for less than adding on Blackberry services. Of course, you don't get the same features, but we're back to having to pay for what you want or need...