I'll refer you back to the "Shadow IT" that was mentioned in the article, while the company I work out has the money to spend on something like this it would never go anywhere since we are a "startup" (Stretching the definition a little) and any cost over $0 is heavily scrutinized (for better or worse). We still use jabber because "It's Free" and now that we have 70-odd employees switching to Slack/HipChat seems like a huge expense. I will readily admit that the issue here isn't as much the cost as much as the people making the decisions thinking that ChatProgramA == ChatProgramB except for ChatProgramA.cost < ChatProgramB.cost where ChatProgramA.cost == $0.