Neither "purposely ignoring" nor "not getting it", but hey A for effort dude.
That monthly income you've calculated is 'the ideal', and that ideal is theoritical. I'm sure there may be some hard working actors who accumulate that amount, but the reality is that the general mass of relatively "unpopular" employed porn actors/actresses likely don't reach those numbers.
Just like I said. It's a matter of perception. It's fine if you believe it to be a large amount for the occupation. I don't.
That's not the ideal. That's what many would consider the standard for any reputable client. I don't know where you got those numbers but not even the grimiest potholes that manage to stay afloat offer a number that low.
The issue that many face is getting work to begin with - not being lowballed to a point of indentured servitude.