This is a good point. If you don't want your photos seen by others, don't put them on Flickr. If you want to sell highres versions of your photos, only put lowr

This is a good point. If you don't want your photos seen by others, don't put them on Flickr. If you want to sell highres versions of your photos, only put lowres versions up. So long as things are properly attributed and only low-quality images are stored/used, I see this as Fair Use.