I've stayed pretty true to my original values after over a decade of shooting porn.
I shoot what interests me, and the types of things that interest me are what I do in my own sex life, and some mild fantasy exploration, so my site is more glam style (but with a realistic feel), and the hardcore content is more sensual couples-oriented hardcore.
All of my scenes still are storyboarded with a plot, and I break many of the trend "rules" of the industry (I score licensed music on my videos, frequently shoot with multiple cameras, etc)
When I delve into BDSM/fetish, it is more from an inquisitive or educational exploration perspective, basically to introduce the fetish, and to demonstrate it's psychological appeal to those with that particular fetish.
I also don't shoot a lot of extreme/fetish/BDSM, because I am not into those things so much in my personal life, so I feel that my work will come across as disingenuine to true fetishists, so I mostly stick to what I enjoy and know.
In my case, I am not pandering to the market, I simply do what I can to have the market for my niche/site find me.
ADG