Posting the links is kind of useless. They need to get votes. Probably the most successful link posters will be voting their own links to give them at least minimal visibility, which means vote power becomes the limited resource, and those doing it will will need to be selective.

Beyond that, even posting the links themselves requires bandwidth, which requires SP. So those wanting to compete by posting links will need to buy more SP, both limiting volume and driving up demand for SP.

And even if the labor differential was not huge, there is another problem. The people who cannot make money writing "long content" (either because theyre bad at english or because they have nothing to say or whatever) are still offered a better hourly by link spamming

You call that a "problem". I call it an opportunity to be more inclusive. Instead of shutting out people with weaker english skills or less captivating personalities, I'd rather have a system them offers them opportunities as well.