The people who understand that hotlinking is wrong have now taken to ripping the images off the original sites and uploading to their picture host without credit attributed to the original source. This is still wrong.
Copyright law says that you may not reproduce copyrighted work without permission. Uploading a copy of someone else's photos to your own server for public display without permission is illegal, no question about it. What's more, you're also taking attention away from some smaller and less recognizable luthiers by not attributing the original source of the image, so you're in the wrong on legal and ethical grounds.
The size of the crime doesn't matter. You can go to jail for stealing a 25¢ piece of candy. Somebody, somewhere, does care.