Why PHP coders cost is low?

I have found out that PHP coders get the lowest possible salary in the market. And that means it is not one of the those languages which pay good money. That being said, I have also seen that Envato projects based on PHP are not much high cost. This worries me as I have some PHP background and at workplace we make use of WordPress and PHP.

Do you think PHP based projects are always low cost like this?
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