As I'm starting my fifth year here in DT I started getting automated messages from admins regarding old images.
The message indicated that I have an image which is online for 4 years now and have no sales.
DT suggests 3 actions you can take, re-keywording the image, donate it or disable it.
I can truly say that I have some old images that today I wouldn't upload, or maybe change them a bit befire uploading.
It mostly relevant for image processing (which my abilities have drastically improved during those last 4 years) and composition.
My decision was to donate them, and apparently - it pays!! :)
Just 2 hours after donating this image:
(which you can download for free now :) )
I can honestly say that this image is not one of my best and probably if I had to decide today I wouldn't even upload it.
So It was a very easy desicion to donate it.
2 hours after donating this image I had 2 sales of images which are online for almost 2 years and haven't sold yet:
So, bottom line, my suggestion to you - don't be afraid of daonating old, non selling images.
If they haven't sold for that long they would probably never sell, but (and that's a big but), donating these images can sell other related images you might have.
By donating your old images you increase the exposure of your portfolio which can of course leas for sales.
Good luck with you donations,