Back to AC... I don't think she did it because she wanted to loop a circuit for 12+ hours a day for 365 consecutive days... clearly she did it because she wanted that record. Why people want records? You can find a million reasons, but ultimately they all boil down to fame and notoriety, which on occasions can be turned into cash, on others less so.
What I said earlier is that the return on investment for that particular effort is pretty poor. A greater level of notoriety (and more money?) can be achieved without the need to invest so much time. This is a fact, I don't think you can realistically argue with that.