It varies from person to person. You're saving $1,000 per year, but what is time worth?
I average 60,000km/yr. Averaging 80km/h (between city and highway driving) I spend a total 750 hours, or 31 days. If I speed (which I do) by 15km/h, I now have an average of 95km/h. Speeding, I spend 631 hours on the road, equal to about 24 days.
So, I'm not talking reckless driving, I'm just pushing the speedometer a little bit above the limit. In fact, I've never heard of a ticket being issued for anything less than 20km/h over, and true to fact I've driven past police cars and speed traps at 15 over without being ticketed.
So... only a small increase, safety not compromised, police don't pull me over, and I gain 7 days more time to my year. $1,000 in savings just doesn't seem worth it to me. I've no intention of slowing down.