I have a twist to this thread. I have also been firmly in the camp of only using commercial yeasts. I've even further limited my commercial choice to Renaissance Andante, a carefully made breakthrough yeast that eliminates any possibility of H2S. So, getting to that point, why would I want to abandon this and try wild yeast? I was reading about this last year and just never did anything, but this year I'm tempted to try commercial non-saccharomyces yeast. Chr Hansen makes a few options here. The theory is that these yeasts will grow for 1 to 3 days, barely invoking any alcohol fermentation, but they are actively dominating any "wild" yeast strains and imparting their own characteristics that you may not be fully achieving with your regular fermentation yeast. They have three non-sacc yeast options; FrootZen is known for increasing the fruitiness characteristics and used often with whites - Concerto is known for amplifying red fruit or strawberry while manufacturing lactic acid to increase acidity and lower pH - Prelude is a heavy producer of polysaccharides and helps to promote fuller body and mouthfeel while imparting dark fruit character, like plum. Another bonus is that these non-sacc yeasts are also big oxygen scavengers and act as protection. You add them immediately upon crush and leave things for 1 to 3 days, the longer you wait before adding your normal yeast, supposedly the more pronounced the attributes. As your regular yeast takes off, they quickly overwhelm these non-sacc ones.
So, it seems you can capture some of the positive "wild" attributes while still enjoying the protection of a controlled commercial yeast ferment. I'm thinking of trying this on a barrel of Cab-Franc this season, using the Prelude yeast before my normal Andante.