I meant that they'll give you a visa if you make more than a certain amount not if you invest over a certain amount. I've now edited my comment.

Sorry, you said "so long as you pay over a certain amount", so I just took the comment at face value.

>if you make more than a certain amount not if you invest over a certain amount.

I don't know any developed countries with that system. Do you?

Yes I've received job offers in developed countries under such schemes.

There might have technically been other minimal requirements like knowing English or the local language, but most people who fulfill the pay requirements will fulfill the minor requirements too if applicable.

Do those minor requirements include working in specific industries, and are contingent on specific types of job offers?

If so that's not the same as an income requirement at all.

If not, I'd like a list of them because that's very interesting.

One example is the Blue Card for Germany. The required amounts are ridiculous. It is not used a lot though, I guess people don't want to learn German :)