OK so BULL might be the wrong phrase now, it's based more on my own feelings about what happened here. My reasoning is not necessarily to charge less but to charge more.
We (my wife sells morethan I do) were here to sell tickets for a concert but had problems due to the price when you round up ticket prices you double the roundup ammount for a couple buying tickets.
SO! how does your system work when everone else is charging 12 or 13 local units for a CD. Do you stay at 12 and be underpriced or go to 15 and not sell any? That's why I "don't like" people NOT using change as an excuse to round things up or down as applicable.
Another part of my reasoning is that here (Canada) the groups I have been involved with provide a person (free admission) who sits by a CD table all night and sells your CD's for you. This is done with or without a percentage commission as per the feelings of the particular organization.
Nothing personal was meant,by BULL. JohnB.