Compelling reason: If the FSM saves you one trip to the dealer's serivce department, then it will have paid for itself. You'll also save yourself from the guilt of obtaining a pirated copy that I can see is already starting to eat away at you.
I got a used FSM for my HD for 30-bucks on fleabay...if you keep looking, one will prob turn up - or you can gamble 10 bucks for a p-ware copy. Unless you know a 15-year-old kid who can look for a P2P copy out there in the ether - those are about your only options...
Even at 60-bucks, the FSM is worth the cabbage in my opinion, unless you're going to have the dealer swing wrenches on your bike all the time, or you're not going to be keeping the bike for very long.
FWIT - most of the $6 fleabay electronic manuals looked like junk to me - but they do promise 100% satisfaction - or your money back! (less shipping and hastle I'm sure...)
"Those who beat their swords into plowshares will plow for those who do not."