The Penny, The Cent, wow, the mint produces these things in K-Zillions.
It is not the cost, it is the Morons who throw them in Big damn Jars and a save them for What? Cause they are Morons!
From a Marketing technique, having a price of a say $3.99 looks better than $4.00. Why? People are stupid and look at the first number, not the total.
$3.99 is a lot less than $4.00!
Example. An Item is $3.69, depending on the tax base, the total comes in at $3.99, not $4.00. Ergo, it is cheaper than $4.00! People are happy!
It is called a mind set!