Buzzfeed of all places has a really great article/interview with Sam Witwer that discusses why the entire creative team decided to go to the network and end Being Human, as well as the sacrifices they all took to keep the show going.

Due to budget cuts to an already small budget, they ran this last season like an indie movie. Highlights include Witwer confessing to spending his own money on production, calling in favors, and letting it drop that they may not have had the money to put guest stars in hotels, so they housed them in their own homes. Talk about genuine love for a show.