I've only been on JSA once but they did almost sanction me... When they discovered that I had "voluntarily" left my previous employment
in Dundee when our circumstances changed and we'd had to move to
Lancashire 
. I managed to convince them that an 8-hour-round commute costing over £100 a day was just a touch unreasonable.
And honestly we were so ****ing poor on Jobseekers, it was a miserable existence. We were struggling even when I was working full time at min wage and we had tax credits for our first daughter
. I personally don't believe for a second that anyone chooses that existence who isn't majorly depressed. The idea that people are "living it up" on benefits is absolute nonsense, unless they're committing some sort of fraud that means they're getting way more than what is normal (or working cash in hand on the side).