Russ, I understand your feelings. Of course people cannot attend every festival and their money should go to the festival that they know they will enjoy.   By "tweaking", I was also referring to the simple task of sending feedback. I believe both Old Songs and Philadelphia Folk fests have "guestbooks" or online surveys. Voicing an opinion does not have to cost much! Sure, there is more involvement needed to make change, but you would be surprised how much effect a few comments can have.

I'm not sure about "changing" a culture. To me, folk music has always been a reflection of culture.   The folk revival of the 50's and 60's (and actually 30's and 40's as well) happened because it filled a need and spoke to a wider audience. IF the issue of not having traditional performers in a lineup is felt by enough people, then it will change.