These price are a PURE SCAM
You can get 1000 very high quality follower for 30$
Or normal quality for 10$
1000 subscribers for 150$ is a complet pure scam, its the price of a monetized youtube channel ! do your own research !
Charging high than normal cheap quality service, doesn't mean they are scam, all professional and top level youtube Managment service provider, charging above $300, and result is always 100%