Not really suprising though is it. John has worked hard to get Retrobike publicity in whatever MTB comic it is that now features BOTM winners. Some of the kids that read it will check out BOTM to see what it's all about, will vote for the shiny bike they like without knowing what it is, see all the petty bickering and squabbling that has been going on for the past few months on numerous threads and decide that the site is just too childish for them which is why their post count remains in such low figures.
Then again for the conspiracy theorists it could all be a fix but as no bike has 50+ votes it probably equals itself out and isn't worth fretting about.
Ultimately they're just pictures of old bicycles so I don't think there's a need to call in independant UN electoral observers. How would they fit the blue berrets under or over crash helmets?