Let's turn the question around.
What tool have you sold you wish you hadn't let go of?
I inherited a large, heavy duty scroll saw from my father. I never thought scroll sawing would appeal to me so I sold it.
I still don't think doing a lot of scroll sawing would appeal to me. I just don't have the patience for it. But, there are times I would like to do some decorative work or make other inside cuts. That big ole SS would be handy to have but it's gone.