Interesting blog by Dara O'Kearney (slowdoke on stars) about his approach to MTT's and how much each "box" on his screen is worth, ROI and his approach. Here's a taster:

... When I am deciding which boxes to fill my screen with, first prize money doesn't even come into it. What does is how soft I think the game will be, how long it will last (at the start of my session, I'm looking for games with good long structures. By the end, I just want a few hypers to fill my screen while I wait for my other boxes to disappear)...