NASA pics, why get them here?

If the flood of pictures here recently are genuine NASA pictures, then why
not just got to www.nasaimages.org and get them from the source.

From something I read recently, NASA have supposedly made available their
entire collection at the above site, and that's where I've been going to
find anything I want. As well, each picture has a good set of explanatory
notes to go with them.

Maybe I'm wrong and I've missed something of value by killfiling the lot
here.

PhilD