What would I get by becoming a greater philosopher than Ayn Rand? Does someone need to be the greatest philosopher to be happy or rich? Don't most people get successful even by solving problems mediocrely. I also don't want to be hated a lot.. being disliked is fine but not hated.

being vastly wiser would let you make much better decisions in your life about everything, and give you much better ability to solve problems you face.
of course some people get rich in other ways.
the happiness of bad thinkers is questionable, though. their lives are full of unsolved problems and evasions. and they are stuck in a lot of ways, rather than making unbounded beginning-of-infinity style progress about whatever they choose to work on.
your desire not to be hated is one of the many, many flaws you could fix if you were much wiser.