SOD,Yes,I would be with you on this,20 years on,I am still happy enough with my "Chinese junk"
Problem is that buying secondhand means that you are buying some other guys problems,OK if you have time to solve them,and they come at the right price. Otherwise give them a miss,and get something that works of of the box,or crate. Life is too short to be messing around.
Stands to reason that any machine that has been around for half a lifetime,has been through the wars.
Do the sums !! Do you really want to be setting it up for someone else ?