OK
I have not been invited, but I am pretty sure I can handle this better than any of the invited ones. I am a linguist, texts are my expertise, and I master the SEO techniques if you ever need them. Of course, the rates are fairly low, but as you said, it will increase once my good writing skills are proven.
There is a portfolio of mine in my profile, you can check it out if you want.
I am readily available and would gladly accept a long term project.