Ummm.... hell no... 10 gigs a month is pathetic... so if you went over that you could only surf the net after 12am to 8am? fail...
This is an $18/mo option. For the web surfer/emailing grandma, this is great compared to $45 for 250GB. What the heck does she need that for? Don't you thing some percent (10? 20?) use under 10GB/mo and would welcome the savings?