I wouldn't be put off too much, Blake. The point being made here is that coins like the Gouby X, 164A, and 1903 open 3, are scarce, but not rare. Hence they aren't going to command that much of a premium in low grade. That was pretty obvious anyway.
Conversely, the F169, which is rare at all grades, and I understand >20 in existence, will always secure a high price. Obviously the price will vary somewhat, due to how strongly a given example is sought after on the day, but consider these hammer prices:-
Workman Nov 2010 - £1200 VG
LCA 3.3.13 - £1600 NF
LCA 1.9.13 - £1400 VG+
LCA 1.6.14 - £800 NF
LCA 7.6.15 - £820 VG
LCA 6.3.16 - £1700 VG
LCA 5.6.16 - £500 VG
LCA 3.6.18 - £1100 VG
Baldwin of St James 12.6.19 - £420 VG