I agree with the thesis about an addiction to fame and adoration, but on the other hand, I also agree about the need to stay busy and keep doing things. To me, Bruce definitely strikes me as the kind of person who couldn't sit on his hands for long doing nothing. So I think it's a combination of things.
I don't think he's actively craving fame and adoration - he's simply used to it (going back to the good old '80s), he knows that environment, and he naturally thrives in it and knows how to operate within it. During the '80s, he was basically trained to live such an active lifestyle through constant touring, etc. And then his personality comes into play: he's more extroverted and feels the urge to do things, to be active and to be more in the spotlight. Those are simply his personality traits.
Look at Dave, for example -he was also touring and living an active life in the '80s, but he's not in the public eye any more than absolutely necessary. He's more laid-back, and after periods of intense activity, he seems to enjoy being left alone with his family and spending time in Hawaii, surrounded by nature, beaches, sunshine, etc.
So Bruce's personality is simply well suited to being a frontman and a creative person. That's my take on it.
If you're fine with that kind of life and you're not fighting it from the inside, living in the public eye must be immensely fun, I guess. I couldn't live such a life myself, though. I think my psyche would go berserk after a while.