Reused the crushwasher on my FJR for years and never had an issue. A few oil changes ago, a friend of mine showed up just as I was breaking the bolt. He started "helping" and while I was doing something else, I caught him with a screwdriver and my drain bolt, washer half way up the threads and mangled.
WTF??!! He told me he was surprised my washer was stuck on so tight. I explained to him it had 40k miles on it. Then he said, "WTF, I change them every change and I don't need to?" Haha...I happened to have some extras, so no harm. I just put a new one on there and it's been good ever since. My buddy still has not changed a crushwasher since that day, and no leaks for him either. Haha...
As a side note, no vehicle I've ever owned has needed a crush washer and none of them ever leaked a drop. Why are MC processes so ******* involved when they don't need to be? If Ford, GM, and all the other car/truck manufacturers can make an oil pan and plug that doesn't need a crush washer, I'm sure Yamaha can figure it out.