Having a bit of a poke around on eBay just before I found this Giant OCR 3 bike for auction with a Buy Now price of $800. Second hand, no warranty, or at least no shop to take it back to, could probably do with a service, so that bumps the price up by at least $80, not to mention picking it up. Say around $900 all up. I had a quick google for a similar bike. Ivanhoe Cycles has one advertised for $595.00 brand spanking new without any bargaining.
eBay sellers are blinded by thinking sunk costs matter to buyers and Cash Converters buyers must work overtime to reduce the cognitive dissonance enough to convince themselves that second hand is always a bargain no matter what. It's a funny old world isn't it.