I vote and politic with my wallet, so I refuse to purchase anything like that. However, if I were to obtain a free copy, I'd probably read it. One thing I feel about the situation, is that he should keep his mouth shut. Also, most innocent people try to convince people with every breath that they did NOT do it. They want all eyes off them so they can try to resume a normal life.
Conversely, O.J. has been daily besieged by the press and detractors who have prevented him from fading into a private life. Perhaps he's so ticked off by constant annoyances that he decided to write the book as a way to jeer at all the people who hate him. Who knows? He's obviously not in his right mind anymore.