There are some people doing exactly this with the Mario series as well, which I suspect can be quite longwinded what with all the spinoffs. Apparently they're playing every Mario game with Mario in it, even Mario Hotel.
TheSpeedGamers. They do a lot of marathons for charity, previously they did a Metroid marathon, and their biggest one last year was Final Fantasy where they raised $50,000 for charity.
"... and so I close, realizing that perhaps the ending has not yet been written."