If he told me that that was fair wear and tear - I'd take him around every single fucking used bike in his shop - of every make and model - and ask him - in an increasinlgy loud voice -
How old is this bike?
Are the spokes fucked?
So why are mine?!!!!
Next bike:
How old is THIS bike?
Are the spokes fucked?
SO WHY ARE MINE?
Next Bike:
HOW OLD IS THIIISS BIKE??
You get the picture!
I would literally rip his argument to bits by pointing out that every ten year old bike in his shop had shiney decent spokes.
Wear and Tear??!!!
MY ARSE!!
