I recently sold mine too. I had owned mine since 1996 and only decided to finally sell it because I really wasn't using it other then to boot up every 3 months to convert a disk to ADF or check a CD's contents.
So far I've not missed the A4000 too much as I have a well specced gaming A1200. Maybe in the future I might.
I do know she went to a good home though because the motherboard has since been fully recapped, cleaned up, and also some track damage found around the audio area during the recap fixed. So she has been lovingly restored and brought back to full working order again. Had I kept her the issues uncovered would have come to light in a much worse way later on.