The real David Helfgott could not resist returning to the Rach 3, either. His CD recording of the piece is now considered the definitive performance of the work. It's a piece I've played a lot. For me, as it is for most aspiring pianists, it's something you have to do. It could put you right over the edge.
Many pianists injure themselves, physically, trying to play it.
Kahane himself learned the piece when he was 22, but did not perform it publicly for several years. He has performed it frequently since. I've devoted myself so much to the idea that music does have that kind of power. David was saved by the power of music, and the power of love, of course, with the love of his wife, who saw who David was even though everyone around him just saw a nut case. Asked to verify a rumor that Rachmaninoff had tremendously large hands, Kahane laughs.