I don't pay any attention to fabric lines - it's the color and design of the fabric I'm interested in. While this doesn't apply to most LQS merchandise - I do want a picture of the care information on whatever I'm thinking of buying. I lose tags and don't keep insert sheets.
I might take a picture of a finished item just for the treatment of color, or a close up of a block included in a kit so I can augment instructions. Some kits do not provide step by step illustrations.