A friend of mine races in pro cyclocross events across the country. She typically comes to each race with 4 or 5 brand new bikes. Each lap she will pit and swap bikes. The old ones are immediately discarded, as they are unsafe for any future usage. Some other riders even have new frame handups halfway around the lap because they don't trust their carbon to last a full lap at race speed. There are still dozens of catastrophic injuries in every professional cross race due to failed frames. It's really a sad story.