Many people come here just to post their YouTube videos. That is all you have done. Are you the next "YouTube Millionaire" trying to get people to look at your videos? I hope not.
Here is my advice:
* Be an active member of the community. Participate. Answer questions. Help out.
* Start one single thread for your videos. One thread only. Add your new videos as a new post to that one thread, rather than starting a new thread for each video link. That's what the respected members do here.
Most of the YouTube video link people like yourself come and go quickly. If you think that you can get a lot of subscribers from here, it won't work.