Did I witness the wanton disposal of many, barely-used, headsets?

Dear Air Canada,

On arrival from Calgary last night I noticed that the flight attendant collected all the in-flight headsets that people did not want to keep for future flights in a trash bag, along with the rest of the garbage. Is it common practice for you to freely distribute these headsets only to send them to the dump after a single use? If so can you please explain this wasteful policy to me in further detail.

Thank you for your attention to this matter.