How many devices in your home are connected to the internet?
Bear in mind that there are there are many other internet-connected devices that might not be immediately considered after the usual smartphone, laptop, tablet and PC – such as: satellite or cable set-top box, bedroom alarm clock, security camera, games console, printer, television, digital camera, Blu-ray player, picture frame, home-cinema projector, NAS drive, baby alarm…
Dunno what is going on with the crazy pie chart. I'll get one of our crack team of developers to look at it just as soon as they turn up/put down GTA.
Blackhat polls are on every page on the site, and the forum accounts for only around 7 percent of total site traffic. I expect that forum users vote more than do casual readers (that's why we love forum users) but as you point out there are always way more votes than views of the thread.