Open exhibitions and entry fees

Price worth paying or licence to exploit artists?

Interesting article on the a-n website about open exhibitions and entry fees. These are often the only way for unknown artists to get their work seen by a larger audience alongside works by established artists. Is it right that artist's pay to exhibit and often pay a commission on sales too? And is it fair that the many artists whose work isn't selected are paying towards the funding of these exhibitions?

Link to article on a-n website