I've been rear-ended twice in the last six years.
The first time, I was stopped a traffic light, and the person just drove gently into me. I managed to stay on the bike, and there was there was no visible damage, but I got the guy's name and address in case anything came to light later on. The bike was fine, though.
The second time was last summer; I was coming off a motorway, waiting to enter the roundabout, and a girl drove into the back of me. The first I knew was when everything looked a bit wrong, which was because the bike and I were on the on the floor. I was fine, and I couldn't find any damage to the bike at the time other than a few scratches on the crash bars, but again took the girl's details, and when it was clear that the bike was riding fine, I threw
Some months later, I got around to washing the bike, and I found one that the crash bar that had taken the fall had cracked right through where it was mounted on the bike, and it was £150 to get a new one. It's true I guess that the girl should rightly have coughed up the £150 and not me, but when I look the cost of the repair against the cost of owning the motorbike for a year, I reckon it's not worth getting myself worked up about it. Better by far to get back on the bike and enjoy riding it.