Suspension: I don't really agree that racing promotes worse wear on the suspension than road riding.
I had a road bike which had little resistance in the first part of the front suspension stroke (and thus excessive dive under brakes that couldn't be tuned out) because it had been ridden around Japan for 40,000kms on highways, hitting cats eyes, and only ever using that top 20% of the suspension's stroke.
With a race bike, the suspension deals with big forces, but does a lot less kms, and it uses the full range of its motion, meaning more even wear...so even if it is a bit worn, it still feels better than the above mentioned road bikes, and will respnd to hard road riding better.
Frames: Unless crashed in such a way as to damage it...hard use won't wear it or make it bend more.
Brakes: Yep, they will wear out, but it's probably the easiest thing to check the condition of on the entire bike.
Engines: Debatable, but as far as usage goes, as mentioned already, these bikes are made to be revved to the heavens. Maintenance? I change the oil and filter in my race bike after 2 days of use at the longest, using quality fully synthetic oil. It will also go through less cold starts in a year than the average road bike would go through in a fortnight.
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