Estimates show the average household will use 200 GB by 2012. A 5 GB cap is obviously not going to cut it.
See the 2011 AirCard Rental Review for the most recent info.
2 year mobile broadband contracts aren't for everyone. Neither is having prepaid wireless broadband hotspots all across the country.
Sometimes, you just need to be able to get online for a couple days while you're at a business conference, on vacation, or RV'ing...