Think you're good at turning down the upsell? Try saying no to adding WiMAX to your home internet service for the low, low price of whatever Comcast wants to charge. Thanks to a multi-billion dollar tie-up with Clearwire, Comcast has been offering WiMAX-based internet services in a few markets, but now that On Demand Online is a go, it makes sense to think that the operator would use that as leverage to get people hooked. For those unaware, ODO enab
