Do you mind me asking how much you make from 300k subscribers? Or how much someone could expect to make based on subscribers?
I know I have subscribed to a few channels and watched them a lot initially then found them a bit boring after while. I never bothered to un-subscribe. (Somewhat related - interestingly my Stack Overflow score stays quite consistent despite not having done much for a while, the answers I have put on there a while ago still seem to get upvotes).