I guess you're not a commuter.Do you honestly need to use an iPad at those locations?
I certainly don't need to be online every single nanosecond that I'm on Caltrain/BART/MUNI, but it's convenient to be able to get there some of the time. Right now, you don't have that option with a WiFi-only device.
Which is why you will see a boatload of notebook computers equipped with USB cellular modem dongles and quite a few iPads (and a bunch more people just diddling with their smartphones).
Of course, a lot of those folks with cellular 3G notebook modems probably have them paid for by their employer.
The fact of the matter is that local US transit agencies are way behind much of the rest of the industrialized world in providing accessible wireless networking.
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