I’ve paid a child $5 not to recline his seat so I open my laptop and work during a Cleveland – Los Angeles flight. I paid a teen $10 for a seat at an OTG iPad near my gate during a 4 hour delay. I haven’t ever bought another passenger’s seat, though.
A View from the Wing reader, though, gave up his seat so a family could sit together and then promptly sold the seat to another passenger for $100. Who would say no to $1500?