Ironically enough, this is how I would define an
Unsuccessful person: Someone who works like crazy and gives up the best things in life.
It is true that to create amazing things (in a short amount of time) can require a lot of focus and work. But that work can be enjoyable, it doesn't have to be crazy. And if you're really interested in what you're doing, the focus can come naturally. But we all have our off days, where it's hard to focus on even the most interesting of work. That's okay, just steer back on course when ready.