Because the links have a short shelf life, they are usually only meant to be used a few times.
When the limit is reached, the link will no longer work and be taken down. So, the link won't be used anymore after a specific time. Even if our site says that the link hasn't been clicked on, that doesn't mean it hasn't been clicked on from other places. So, it's wise to find all the newest links with as few clicks as possible. This makes it more likely that you'll get the reward, not an old link.