What are good sources to buy traffic and video views?

If you want numbers then I don't think that there are any good sources.  However, if you are promoting to a specific audience then try Adwords.

Most SEOs don't recommend buying traffic... instead they recommend setting a goal of who you want to target and what you want them to do when they arrive at the site - then defining a traffic source to accomplish that goal.  Possible traffic sources might be Adwords, banner ads on specific sites, etc. or it could be as radical as buying a successful website.

When I write an article the images always have file names that match the content of the image and an important keyword of the article.  The alt attributes are more detailed because they  provide information to screen readers.

I believe that the names of your image files and the alt attributes are small optimization elements that will help rank a page.  It might be enough to move you up a position or two if you are deep in the SERPs, but if you are in a battle for the top three for a competitive term then authority is going to be far more important than the sum of the small optimization elements.

Who is going to bet against Michael Gray?  I think that you should listen to him.

I would give his answer one tweak.  He says....

If the product goes out of stock forever, you have a couple choices. You can leave the page up with a discontinued notice on the page. IMHO that’s not the best way to go for search engines. Ideally I’d like to not lose any link equity and 301 the product page to a similar product, category/department page, or home page.

I would do exactly what he says 99% of the time, however, if that page is pulling a lot of search engine traffic and same manufacturer has a replacement product or something close that substitutes, I would leave that page in place and use it to explain...  "This product has been retired but a new and improved widget is available... (then give the sales pitch for the new model with a buy button).  This approach would be especially valuable if the product is something like running shoes where repeat customers with very high loyalty are looking to replace their favorite shoes up to several times per year.

When this shoe was replaced by Addiction there was a mad scramble to buy up all existing stock...  (I am probably only person posting here old enough to have worn out a couple dozen pairs)