I have seen the same trend and racks and cello's seem to have benefited most. Clearly that is due to the fact that you lose two cards per pack when you open wax one to wax seal and one to gum. So if you are looking for 9's and 10's cellos and racks are the way to go. I began putting away unopened in 75 and yes as prices rose I have sold off most of my packs. But I had much more product 1980 onward, than I had from 75-79. So I believe that unopened from the 70's will continue to increase and is almost always a good investment. I don't buy much because I cant keep my hands off them and opening packs of baseball cards is still one of my favorite things to do,
Regards
Jonathan
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