For most of this season I've been using some old Bontrager bars I had laying around after I broke my [carbon] 3T Ergosum bars. I bought new [aluminum] ones but have been too lazy to swap them on until I need to replace my bar tape again...

As far as the OP's question, I destroyed an aluminum frame in a crash, but I've crashed my carbon TCR countless times during the 25k-30k miles I rode it before replacing it with my Tarmac. Rode that Tarmac for a season and replaced with a Tarmac SL2 which is in it's second season, and has probably 20k-25k miles on it as well.