I was really considering picking up a unlimited sim off ebay, but they're overpriced. I really want a pay per use plan on like for a LTE-iPad, like just for a couple days at a time.
The plans they offer now are useless to me.
AT&T needs to introduce pay-per-day plans. Charge me ~$10 for a week of 2gb data. It would be great for people who take trips every so often. It doesn't even have to be AT&T. Even if VZW does something similar, I'll buy their version of the iPad. If I'm using more, I'd just subscribe to a normal plan or tether off my phone or work mifi.