Posted By:
fkwSupply and Demand!
Those are fairly common sets (except N172), and there will always be a good supply of (low to mid grade) cards available, so the value will be held to a more reasonable price, except the extremely high grade cards.
Also multi-player cards are not as popular overall, so in less demand.
Big jumps will be the Very Rare Type Cards and 1910 era "E" sets (25-50 in set size), as anyone who has followed prices in the past 5 years knows very well.
If a set can be completed in a few months with less than 50 cards, there is a high demand for these (1910 "E" cards).
If a rare type card is only offered 1-2 times a year, there will be more of a fight for it. If a common card is offered 10 times a week, who fights?
With new collectors getting into PreWar everyday, and the splurge $$ some people have, the rare ones will always go up.
I still see G/VG T205/T206 commons at $10-$20 ea, the same as I did 15 years ago.