If this will be one-time purchase - it makes no sense. You would better spend money on advertising, so it could bring you more subscribers as well as more views.
It really depends on your needs, however, that business tactic is not in compliance with ethical standards. So you should be careful.
this is a bad idea, youtube may not consider such views, but for the initial promotion many take this
No its not good to buy YouTube views because they are totally bots and they have nothing to do with your content. I also want to know why you want to buy YouTube views ? Making a good video is time taking process and if you want to generate ROI from your videos then try to get organic views on it instead of fake or paid views. Try to show your video among those who are looking for that content because i think i will provide you better results.
I don't think it is advisable to buy views as your account can get suspended if Youtube finds out. The alternative is to pay for promotion like postings to Facebook pages and groups or to Twitter, LinkedIn, Pinterest etc. These will be more expensive but are pretty much safe, in my opinion.
It's best not to buy views or subscribers. When things are organic and you get views and subscribers they want to be there. Paid for views and subscribers often just boost your number, which really doesn't do a whole lot for you in the long run.