Reaching that milestone is definitely tough, but buying watch hours feels risky. People who used the smm world panel and a lot of other sites actually noticed a sudden plunge after a while because these end up being bot views. It's really a gamble on whether Youtube's systems will see right through it and I prefer not taking those risks.
What's funny is how much focus there is on the numbers. It's all about subscribers, views, watch hours... it's easy to forget that the real goal is just to create good content that people enjoy. All this gaming of the system almost feels like a distraction from that.