I've been thinking about this since I first saw your meme. The no_noobs (10k) posting rule goes back to the early days of streams. Back then they were called Meme Streams, because you could only post images with the meme generator (no gifs, etc.).
imgflip.com/i/l5jxq
The way comments in Meme Streams worked, they never showed on a users profile. There was some crazy stuff going on in the shadows and the underground world of Meme Streams.
When the fun stream was first split, there was a short lived glitch where comments behaved like the Meme Streams, not visible on profiles.
I think 10k rule is outdated and doesn't serve the original purpose, which may have been to control image spamming from new accounts in Meme Streams.
Since you have a limit on submissions, I think the 10k rule is not really useful for what's going on here in this stream today.