Everybody has sales. If you're in any kind of retail business, there are times when you'll try to boost shopping and exposure by having one. Even at the POD's, where you can set your own royalties, if they have a sale, you get a reduced commission.
 
What you DON'T have to worry about here at GCU is: cost and maintenance of printing, supplies, inventory, staff salaries and benefits, website maintenance and tech updates, customer service, etc. etc.
 
I'd rather take the 10 cents than all the headaches of running a business like this!