Do you mind to share with us if your videos on youtube is related to your website or just some random videos that attract a lot of views.
puting website link as signature link is also have more backlink. The best way to make many money from Google or any Advertising network is SEO SEO is a good orginal traffic source
Yes, Youtube is very good source to redirect interested traffic to your webpage, a video says thousand thing and people get more attract on a vide presentation