kevin_standlee got kicked off a blog for arguing that he didn't think there was much evidence of gaming in the Hugo Awards. The thesis being presented, mostly to explain how John Scalzi won, was that Tor, by stint of being a large publisher who pay for a lot of people to go to the Worldcon, are able to effectively block vote their preferences. Now, apart from this being, on the face of it, one of the most fucking stupid ideas I've heard in a long while, I did decide to go and look at the data.
So, trawling back through the last decade I was curious to see if there was any real evidence that Tor being able to send 60ish people to a Worldcon had any impact on their ability to win. And... tl:dr - no, not really.
Ok, so my problem with your thesis is this. If I go and look back at the last decade of Hugo winners I see the following:
TOR (with their house advantage) – have won 4 times in the last decade from 11 nominations – RotP have won 8 from 29 – similar win to nomination ratios there. There’s a lot of different sizes in imprint there but if the scale of the Tor House effect is real I’d expect to see more evidence.
Alternatively I can look at the winners from Tor and see if there’s a pattern:
Spin 2006 – I’m a bit ‘meh’ on Spin, I voted for Accelerando, but Charlie Stross was less well known in the US then and probably only made the ballot because of left over Brit nominations from 2005.
Rainbow’s End 2007 – no question in my mind best book of the batch and the year.
Among Others 2012 – Wasn’t a fan, but a weak field. I voted for Feed because nothing really grabbed me from the list
Redshirts 2013 – Weak field, weak book. Didn’t vote this year, but couldn’t finish 2312, and I wouldn’t vote, normally for sequels or series.
Years Tor lost…
2003 – strong field, didn’t much like the winner, actually voted for KSR that time
2004 – didn’t vote, not big on any of them, dealers choice
2005 – Ian McDonald got steamrollered by the Bloomsbury Publishing machine… the vote was close, so I’ll give you a point for this being a year that the publisher skewed things
2008 – big field, Neil Gaiman won… I expected that to go to Anathem, but big year, hard to call
2010 – tie for first, Boneshaker, which I thought was crap, lost
2011 – Tor didn’t make the ballot
So the one year where's it's possible that there was a publisher effect is 2005 where Ian McDonald lost out by a narrow margin to a book from Bloomsbury which had a stunning, if rumour was to be believed, marketing budget. That said, I do know people who liked Jonathon Strange and Mr Norrel, I was not one of them. I thought Ian was robbed. Apart from that there isn't really all that much of a pattern there that I can see. Nothing that suggests that Tor have some strong lock on the Hugo and the year's they've one have seemed to be books that people did think highly of.
Anyway. Facts. Damn them eh?