1
One of the most interesting things pointed out yet. Sifting through the data it seems playing time is the main culprit (elite Cs get MUCH less PT than elite 1B in the history of baseball).
Most value is collected though hitting so hitting-scarce positions generally have less stars, but its few elite catchers hit the list even in comparison to SSs and 2Bs.
Since 1980 there have been 169 3+ WAR Cs seasons and 299 3+ WAR 1B seasons.
After sifting through the data though, it does seem as though C really eats into a player's longevity. They get less PT (the #1 reason) and have shorter careers.