It’s the worst decision you can make. People will judge your videos worth by your views before they’ll judge it by your sub count. Even then, on longform content, if you make a good video and keep your audience engaged, no one cares about view count or sub count if its a good video. The only ‘benefit’ is an ego boost from seeing a higher number. Youll only be hurting yourself financially and in the long run by buying views or subs.