Coupons running out of prints

Some people have mentioned about going to print a coupon and it gives a message that you already printed the coupon when you never did.  The real reason is that the coupon is out of prints.  I don't know why it doesn't just say "out of print."  Almost every coupon online has a designated print limit that we don't always know what it is.  It could be 100 or 100,000.  I usually try to stress for people to print a coupon ASAP when it's a high value coupon or a rare one that will go fast.  Facebook coupons are the worst for this because they usually have low print limits.  The companies are wanting to get traffic to their site so they will advertise a great high-value coupon but only make 500 available at 12 noon.  Just wanted to clarify that for anyone who gets frustrated like I do when I can't get a coupon to print.