The OP raises a good question and I personally have been on this site for almost 24 years now I guess I never felt a need. Things have changed since my early days here and everything certainly has changed since then. It seems to me that everything now is open game to be discussed in the public domain whether it is personal or private in nature. I have never subscribed to using any public forum outside of Audiogon, to vet any personal or private material and will remain that way. With that said, some of the reasons I have not gone down the OP's request is that I do not know how, and also for privacy reasons as I have noted. Some of these systems can and do cost a lot of money and I would think that some may have a general reluctance to post photo's due to insurance and also security reasons. Also, some may have decided not to post due to the fear of some unscrupulous people in this world who have bad intentions.
