I dropped mine the day they allowed people to do so, and I have yet to regret it so I think you're wrong.
That was in June of last year, and I've yet to go over the 2GB limit, so I've saved $5 a month for 12 months - $60. The way I see it, if I ever go over (which I doubt I ever will), it's $10...and the amount I've already saved will cover that. In the end, I'll still always be saving money.