I disagree with this gallerist. A gallery that adds significant value to the process of buying art shouldn't be worried about sharing the names of collectors with the artist. If the gallery fosters an quality environment for art lovers and collectors, then their place is secure.

Sharing the names of collectors does not "hurt the industry". In fact, I would argue that it helps: it demonstrates to the collector that the gallerist has a deep, personal connection to the artist. And it demonstrates to the artist a level of trust and partnership. Both reinforce the gallerist's role in the sale of art.