The motivational aspect is, in my experience, a consequence of working 100% from home. Spending that much time at home can make it hard for me to get stuff done. I'm perfectly capable of being productive when I work from home occasionally...possibly even more productive than I am when I'm in the office since I'm less distracted, but find that my productivity drops off considerably when I work predominantly from home.

There's easy fixes for this--headphones, coffee shop Wi-Fi and a VPN connection work well for me--but I have to do something or I go stir crazy and can't get much done.