There's no need to read minds, reading what I wrote is enough. Why the fucking fuck do you decided that I'm not a "regular forum user" while it's precisely what I am...
Among those who answer the few "from where are you" polls, less than a third are US citizen, a third are European, and the rest come from the rest of the world. So, assuming that around 60% are not native English speakers seem a good guess.
If you take into account that the majority never post, a basic English level is enough to understand how to navigate through the forum. And anyway there's the possibility to read the forum in your native language through browser add-ons and other. You can notice them when they decide to quote someone, because the BBCode tags are also translated.
Add to this that around half members just want to fap on games, and therefore aren't too bothered if they don't understand the dialog.
In the end, I guess that at least 30% of the members don't speak English, or do it with an
(English speaking) primary school level.
The
last poll regarding the age range give 30% between 18-25, and 40% between 25-34. If you extrapolate from the previous
poll, there's around 45% below 30yo, therefore who have high chance to have grown with insta-answers systems and who didn't learned the value that previous answers can have.
As surprising as it can seem, it's English.