It's important to know where these people are getting the domains they are checking! 9 times out of 10, they are seeing them in a "list of domains". It's also to note, that the reason for the list, is most likely a Pending Delete list or recently expired etc.
Remember, there are 6 BILLION people in this world. More and more are moving into domaining daily. When there are companies tasting 50K + by themself in one day, plus the many many other people tasting etc, a lot of domains are registered. If ICANN would put a stop to tasting, there would be a lot more domains for the hand regger's out there......