why are quality cards to hard to find?

I cant seem to find any of the cards I am looking for that have good eye appeal for the grade These are the cards I am haveing very hard time finding that look nice for the grade
1981 Topps Joe Montana PSA 9
1986 Topps Jerry Rice PSA 9
1961 Topps Roger Maris PSA 8
1933 Goudey Babe Ruth #144 PSA 3
1966 Topps Tony Perez perfectly centered PSA 8
1981 Topps Joe Montana PSA 9
1986 Topps Jerry Rice PSA 9
1961 Topps Roger Maris PSA 8
1933 Goudey Babe Ruth #144 PSA 3
1966 Topps Tony Perez perfectly centered PSA 8
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Comments
Robert
And if they do come to market get snapped up quickly.
Many never even see market as they are sold privately.