See here is what happens. A company like neteller comes along and makes it really damn simple to move money. You can do it without ever moving off your couch.
But there are people who still go and pick up a pizza, still put stamps on their bills, and still pay long distance per each phone call they make.
Thus books will always offer you the option of waiting a week for a check and then driving it to your bank. It makes some people happy.
-Sean