What does a Koran cost? You can get a full color one for the Kindle for only 99 cents, just don't expect it to feature any pictures of old Mo. If you want to go deluxe, you can get a hardcover edition that runs three different translations side by side for around 40 bucks. But if you want to be more practical about it, the price of a Koran is the lives of six American soldiers.
The nature of the marketplace of human affairs is that a thing is worth what we will pay for it. Once upon a time Americans decided to pay any price for freedom. The price was high, but they got what they paid for... at least for a season or two. The Declaration of Independence and the Constitution were works of freedom written in blood. They made a free nation possible because that nation was willing to pay the price for them.
Muslims are equally willing to pay the price in blood for slavery, their own slavery and ours, for a book of slavery, written by an owner and abuser of slaves, who created a religion of slaves, where the optimal position was to stand on as many people as possible while reaching for heaven.
The men who fought to make us free placed value on their lives. The men who fight to enslave us place little value on their own. Whatever material pleasures they enjoy in this life, little girls, hashish and wealth, will be vastly improved upon in the afterlife. And they buy their way into that afterlife by killing us, as they have been doing for over a thousand years.