Interesting issue on digg.com - attack of the buriers

Someone posted a link to some information which happened to be on my website (I saw my counter whiz round and checked the access logs to see what was going on)
The story is here:
http://digg.com/technology/How_to_hack_a_Coca_Cola_machine
It picked up a lot of votes quickly and was well on it's way to the front page when it vanished.
By searching for it I found it had been buried.
I realise that the information is something that has been around for a while and probably on digg in the dim and distant past however the fact that it was picking up so many diggs shows that there were still a lot of people who didn't know about it.
In essence, a relatively small group of people who already knew about it had the story buried which denied many others from reading the information.
Is this in line with the ethos of digg.com?, where a small number of users govern what the rest of the users get to see?
Maybe it's a bit of a conspiracy theory but what's to stop a group of people getting together and performing a manual "denial of service" attack on stories not in their interest?

Phil