How much time do you actually spend on the saddle when you are riding some aggressive downhill course? Maybe the finish line and the car park? It's there as a token gesture really...

 thats not what I said I said if you crash it looks like it will snap

 It's very unlikely to snap as the seat mount is steel. A severe crash could break any part, but I certainly wouldn't consider this a weak part. These guys have been in the business long enough to know what they're doing.