Interesting topic. The only vintage minor league stuff I collect is Southern League T206, only because I like tracing the history back to small cities around where I grew up in Georgia and Alabama.
I also think that modern minor league offers collectors a way to have high quality cards of HOFers and future HOFers, whose RCs happen to be produced in the 80's junk-era. Procards and TCMA can offer "pre RC" cards that were produced in 1 / 1000 level quantites relative to their Topps issues, so there is investment appeal as well. Here are some of my modern minor league faves (Apologies to those of you who throw up when viewing cards that never saw a cigarette pack) :
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