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JimBPSA still has the dominant share of some of the mainstream pre-war sets like T206 and '33 Goudey. I think it is mostly because they were in the game first and had a lot people gearing their sets toward the PSA registry, etc. If, for example, someone already had 300+ PSA graded cards toward a T206 set and want them all in the same type of holders, it is much easier to just go for PSA for the rest of them, rather than pay to crossover 300 cards. But starting a set new, one is not hampered by such a decision.
We still have not heard from the SGC cheerleading section: T206 Collector.
I'm sure he will pipe in before long.
JimB