The market for English language editing: Caveat emptor

Those of us who can publish in our native language are fortunate, and so there is a useful market for editing services for non-native speakers (and, frankly, everyone can sometimes profit from a little editorial assistance).

But buyers beware. Here's the beginning of an ad I received by email:

"Research Manuscript Editing Services

 -Are you from a non-English speaking country but wishes to publish your article in an English journal?

-Has your manuscript been rejected for publication due to bad English?

-Does your article requires editing and proofreading but do not have the time to revise it?"