Your reasoning makes sense as to why you put it off and forgot about it. Well done on finally sucking up all those ghosts :B Such a classic game!
I think that really, I finish 99% of the games I start, within a reasonable time (if I end up finishing them). The only game I put off for 2-3 years finishing was Super Mario 64, because it was the first game I had ever played and starting off, I found parts of the game to be -really- difficult. Becoming more of a veteran, a few years later I returned to the battlefield and thwarted that Bowser chump.