I think, on average, the more subs you have the more subs you get
but at the same time, it doesn't seem like as much because you already have a few/some/a lot
As an exmaple, I've gained 12 subs in the last 30 days, to someone with 100k subs, thats literally nothing, to someone with 2 subs thats SO MUCH, to me it's just how it is
They said the same thing about getting to 100 subs, I don't know if there's a specific number where things get easier
I know people stuck at 2k, 30k, even 100k... It's different for everyone!