Yeah you can buy Youtube subscribers on your own risk. But for long-term development for your Youtube channel, it is not recommended for you to do it. Why?
For example, if you create your channel on the purpose of regarding it as your career and make money from it via either Youtube or business cooperation with sponsor, even though you have bought a lot of subscribers, they are not core/real fans that will make purchase from your sponsor; when the Conversion Rate is not expected and your channel cannot bring as more sales as what your subscribers number should bring, your cooperation with them will come to end quickly.
In fact, nowadays the sponsor have a lot of tools to identify the whether your Youtube subscribers are real fans or fake fans, they have their own tracing system for any sponsored partners, so don’t try to fool them with the fake traffic (fake subscribers). Especially if you are a youtube channel about FIFA game, you will be much more easy to be identified if you cooperated with the coins supplier FIFACOIN, M8X and FIFACOINSZONE, if you have weekly sponsorship cooperation, then you may be terminated the cooperation in 1 week if your fake subscribers don’t bring them sales( normally they won’y bring sales as they are not core customers of FIFA).
So, it's up to you.
1, Social medias—-including Facebook, Twitter, Google+, Instagram, Pinterest, WhatsApp, Snapchat, VK, etc. and you can post your promotion for your products there to earn money after you have cooperation with some suppliers. If you have more fans from Russia, VK is your ideal choice, if you are from Turkey, just don’t choose Twitter as people their don’t use Twitter so often; and if you hope more young people seeing your ads, Instagram is a great choice as youngster are more active on Instagram. So it all depends on your situation.
2, Youtube Channel or Twitch —-if you have Youtube channel or Twitch channel and good at making videos, you can look for sponsorship to earn money, it will be the most effective way. It will be much easier for you if your channel is about games, especially about FIFA games. As there are so many FIFA youtubers get the offer from coins sellers such as FIFACOIN, M8X and FIFACOINSZONE, and they can get 46,000 dollars per year from FIFACOIN for long term cooperation.
3, Blogger—-if you have your own blog with a large number of fans, you can also rend ads slot for those products suppliers who are suitable for your blog.
Hope it is helpful for you.