I totally agree with the sentiment and have no issues personally with putting up full resolution images, warts and all
Watermarks largely don't work unless they are huge as they can easily be cropped out. Sites that prevent high res downloading do not present, as Mike mentioned, screen shooting and mosaic re-stitching.
For Astrobin I save as JPEG in 95% quality for easy of use, quarters the file size against 100% with no discernible quality drop. Would sometimes prefer the convent of uploading 16-bit TIFF files to stop JPEG compression image slaughter
