I am surprised how hard it is to find a good used AT Gold. I had a AT Pro but gave it away to a close friend to get him into the 21st century. I am now looking for a AT Gold to have for a backup water machine/prospecting machine to my Etrac. I have been searching all the forums and local classifieds and the they seem few and far between. I see a lot of AT Pro's for sale. Is it because people hang on to them or do you think the AT Pro's or just more popular ?