Sometimes as a listing agent because a seller is unwilling to clean up I am inclined not to show photos of the interior as it detracts from the home. Other than that I have no great answers!!
There is no good reason for not posting photo's of a property. I have heard some agents say they have not had time yet but, I will not put the listing in the system without the photos. The most attention a new listing will get is when it is first put in the system. Most MLS systems will take anywhere from 16 to 25 pictures. The more pictures the more apt a buyer is to look at the listing.
The pictures will do the selling of the home since over 90% of all buyers are looking on the Internet for their next home. You have many people that are relocating to an area that have no other choice. So with that in mind why would you put a home for sale and then hide it so that no one could see it.
They may get a call but they will not get the attention they deserve or need to sell it. Definitely call your agent and ask them why there are no pictures.
It's always up to my buyer, but I'm happy to pass right on by these listings....
I believe that the only way to market a home on line is with the very best photos you can take and really showcase the home to include its best features. Buyers like to look at photos, so I give them as many as possible.