Lazarus Long
Super Member
I would be surprised if you get any hits above $20 as headphones are purely utilitarian devices as opposed to speakers which can have aesthetic/nostalgic value. Superior headphones can be purchased for very little money these days so I can't imagine there would be much of a market for those you posted.
Pioneer monitor 10. Sold listings on eBay seem to average about $60. With the box and assuming new condition they would likely be closer to $80-$90. If they sound good and look cool there is still a market for them.