Actually it makes a lot of sense. It helps to slow down 2 types of people. The first is actual spammers who would try to use this site as a free advertising space. Then there is the other type. Believe it or not there are several children and a few unbelievably immature teens who thinks its really funny to come on this site and give rude, insulting and sarcastic answers. Since ask wishes to be a site which people can rely on for quality answers I am sure you can see why they would try to stop these silly people. Most people who give correct answers would not answer dozens at a time.