The Asphalt Institute has done a number of studies and estimates regarding sealcoating asphalt. They estimate the cost of an unmaintained surface asphalt parking lot over a 15 year period is $39.07 per square yard. If sealcoating is performed every three years the cost is $23.84 per square yard. Looking at the numbers, if you had a 1000 square yard parking lot or driveway the savings over 15 years would be $15,230. Sealcoating gives the impression that you care about your property and keep it well maintained.