Does it make sense to buy high end headphones for listening to music on Youtube?

No I haven’t.

I listen to music at a low volume so I think sound leakage shouldn’t be a problem?
I’ve put the headset I currently have to my normal listening volume and placed them on a table in front of me and I couldn’t hear a thing. I’ve heard (link to that reddit thread) that others will be able to hear the music I’m listening to at that volume.
If that’s true then sound leakage shouldn’t be a problem.

Thanks I will check those headphones and the test out.

Also do you perhaps have any recommendations for closed back headphones?