I understand your requirements indeed, although the probable typo using ($.050 per article) is misleading, I'm sure you meant the figure as followed ($.50 per 1000 words over the initial...), which would correspond to your request of no bids over $50 (if 10 articles/day was the example)?
My expertise is in editing/proofreading, particularly audio transcripts which deal with syntax far more than typical written editing and makes one extremely aware of the flow as well.
I'm a 64-year-old American who works from the Philippines online and have been chief editor for three large American transcription companies the last seven or so years.
Kindly contact me for more discussion.
Thanks and good luck,
Scott