I have posted this in the suggestion thread, and reposting here:
There is nothing that stops anyone from posting in the Buy/Sell/Do or Admissions consultants forum right now and offer their services openly. It can't be anything that GMAT Club can get involved into though - we don't have time/resources to act as a middle person or to endorse/quality control - these things are very subjective.
Founder of GMAT Club
Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books
Co-author of the GMAT Club tests
Have a blog? Feature it on GMAT Club!
GMAT Club Premium Membership - big benefits and savings