Actually it's not. Go! is a totally different language.

But more on topic. This has happened ever since I first started frequenting this site in 2009 (2008?). People upvote links that interest them almost without regard to whether it's already on the frontpage. Personally, I like it. When the first article on topic A gets posted and you get 300 comments, it becomes unwieldy to join in the conversation. The other discussions tend to focus on other issues with topic A or are simply easier to join in on since there are fewer comments overall.