Spam. Just pushing your YouTube videos.-Just stop-It wont end well for you.
I propose a more organic approach.-Participate. Let people get to know you. Discuss some things without shoving your videos down our throats and let people see you as a smart guy or group or wahtever.
Then-When the time is right-Share a timely video that is intended to help someone.
This is just promotional spam.-No timeliness other than 'we need to send people to our YouTube channel.'