I don't know of any legitimate juried competition which doesn't have an entry fee. In addition to an income for the gallery, it pays the prize money, the jurors (if paid), and limits the amount of entries to serious artists. The benefit is being able to add an exhibition to your CV (or, less often some prize money), which is necessary if you ever want to exhibit in the better galleries.
Originally Posted by chriscrawfordphoto
Be forewarned, though. The entry fee isn't your only non-recouped cost. You'll also have to pay shipping, there and back.