> I can't figure out how a feature like putting a resume on the top of a pile solves any problem to do with matching candidates with employers. Much less why good employers would care about this arbitrary order.

It helps them get through the human keyword filter in HR faster, which (theoretically) makes them more likely to get an interview. Even many "good" companies have issues with poor HR filter functions, and on top of that a majority of the jobs seem to be with "bad" companies.

I agree, though, that its set up to prey on the naive and desperate. Those for whom any job is better than no job, or simply think this is how "the game" is supposed to be played.