I have no dog in this fight, but that seems unfair.

OP can understand that $10k bikes exist because there is a demand for them, but still have an opinion that the demand stems from buyers with irrational priorities. He also can have an opinion about the point at which the performance enhancements don't justify additional increase in price due to diminishing returns, but that would just be the point on the demand curve where he happens to reside.

Whether or not our opinion on other people's economic priorities is something worth expressing and/or reading is another subject for debate. I don't generally find other people's opinions on the subject illuminating, and would expect that most people would feel the same about mine.