Re: 24x7
It's all to do with control. It's easy if you can choose when to be available. You're happier on holiday knowing that emergencies will be raised with you immediately rather than waiting for your return. That's not the same as being contacted without your consent (or with your grudging "I need to keep my job" consent).
However, if I was a client of yours, I'd be wondering why there's only one person in the company who can handle the really important stuff...