I do not think there is a definitive way that will clearly make you a guaranteed return on investment. [obviously -- or others would do it].
It's hard to believe that anything postwar would justify such an investment.
Also, with the time and costs of moving material, it seems like buying fewer quality pieces would be the way to go.
There seem to be a handful of examples of cards that have realized significant gains over the past few years. The most recent example that comes to mind is the Ty Cobb Advertising back card, which now seems to be more firmly rooted as a ~$100K+ card, a significant step change from prior years and sales.
However, other cards do not seem to have similar acceleration. the T206 Magie, for example, has not seen much change valuewise over the past few years. You could invest in high-grade, low-population prewar cards, but oftentimes it is a very thin market of interested buyers willing to pay (significant) premiums for such cards.
Rare backs, overprints, caramel cards, etc. all seem to go through peaks and valleys.
I would recommend E90-1 Joe Jackson, or perhaps N173 Hall of Famers.
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