What is with people claiming to be a masochist in a video game, its not like they like having a taser hooked up to their balls.
Worst thing I and others I knew have done in this game was camping Dark Ixion and Sandworm every day, and did so for over a year when they were relevant. Covering multiple zones on multiple characters. and I scanned too, every 20-30 seconds, for 1-6 hours a day.
That was probably the only thing I've done in this game that I would consider bad or self harm type behavior, I hated it but I could not stop doing it. I wasn't alone either, 10+ people in my shell did it every day too and there were 2 other HNMLS that also camped it seriously.
Modern FFXI is great compared to how the game used to be.