why people can't have affordable used bikes

You would not believe the number of ads I see for bikes just like this.  OMG.
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$50  
Raleigh m20 mountain bike

Troutdale, OR

Local pickup (15 miles away)

Posted 19 hours ago in Bicycles

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Used (normal wear)

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Raleigh M20 mountain bike. Series 6061, aluminum frame.
Right pedal is bent so you can not make a full cycle.
Both brakes do not work. Left side of the handle bar is bent.
Otherwise it is a very nice mountain bike.
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These people are simply not living in reality.
Rant over.