Just my opinion of course, but I’m baffled by the use of the user’s Gravitar picture to the left of the listing on the detail page (in the Supreme theme).
To me, it would make more sense to have that be a user up-loadable picture that would be specific to that listing. (Could be a company logo). Call it the Profile Picture, and make it the second one uploaded (the first one being the Featured image, unless subsequently re-arranged).
Adding to the confusion is the “Edit” button that appears under the image when the user is logged in. This implies that the image can be changed, but of course this is not the case. There is nowhere in the profile edit screen that allows the image to be changed.
Just in the case of listings being added through the back end by the administrator, the admin’s gravitar ends up on all of the listings added, which makes no sense.