Kurt, maybe there have been some coins for a particular coin type that did see persistent AU58's selling for MORE than MS60/61/62's..... but that's a quirk/function of investor demand based on aesthetics.
Mint State should rank HIGHER than About Uncirculated, grade-wise. MS60-62 SHOULD price above AU58's -- but maybe not. If investors prefer the look and appeal of an AU58 (with modest wear and high point friction) over a heavily dinged but NO wear and NO high point friction, I think the TPGs have done their job, the grading standards have been adhered to....it's just that folks want the AU58.
I've been very clear on these pages that given that it's already a 5-figure purchase, whenever I buy a 1907 Saint High Relief I am definitely going with an AU58 over an MS60, 61, or even 62. Above that, I might prefer MS63's and higher -- but then you are talking about serious increase in $$$ relative to AU58's.