Some sellers do not take photos of their plants so they wouldn't have any to use; I know several who do not take photos due to lack of time, don't have a camera, really can't see good enough to take photos, etc. I have had sellers use photos of mine and crop them or flip them so they look different than mine without asking but I really don't mind; at least they thought my photo was a good one to use. If a seller doesn't have a photo sometimes they will just google the name of the cultivar and get the photo from the internet to use, I have done this and I try to give permission when I know who the photographer is. I usually look on the site that people load photos and people have permission to use any way they want to first.
http://www.hybridizer.net/dayl... But then it is just easier to use the hybridizers photo than searching the internet for one and trying to get permission to use the photo.
It is also easier to use the hybridizers photo since they are usually already sized to the right specs to be uploaded to the auctions. If a person has never listed on the auction they may not know just how long it actually takes to list things on them. Even with using others photos and copy/pasting descriptions it takes quite awhile to do listings especially when doing new listings where you have to start from scratch; I have spent several days listing mine before and still didn't have them all listed.
Another thought is that even though most people say they want to see garden photos on the auction from sellers they do not sell as well. I have seen garden photos of a cultivar listed and then there is another one or two listed with the hybridizers photo and the one with the garden photo didn't get bid on or had very little bids and the others went for a lot more ; I have gotten several on there this way at a very good price. The seller was very reputable and had been selling for a while but their garden photo didn't sell their plant. In my own experience I have listed some with garden photos and never got any bids on them but as soon as I switched to the hybridizers photo I sold them all. I think some people just scroll through the photos without looking at the titles and look for the ones they want and they only know what the hybridizers photo looks like and that is what they look for.