4 scrobbles per scrobble

I have iTunes, as well as WMP, Winamp, foobar and many more.
So I was thinking.
If you let all music players be found by the Scrobbler, and all their plugins installed, start all your media players.
Start a radio station in the Last.fm Client.
Start music (muted) in every single media player.
All of them gets scrobbled! You can easily scrobble 5 or 6 tracks at a time.

My questions
Why is this possible?
How come Last.fm hasn't disabled this. People with no respect for their own playcount can easily take advantage from this.

I'm not encouraging anyone to do this, I deleted the double scrobbles on my own profile. This was just a post to notify you guys of a bug. Please don't misuse this..