I used to charge close to what you're asking, but someone asked my wife what my sitting fee was, and she quoted a much, much higher figure. They booked me. And, since then I've just started using that higher figure. Know what? I am shooting more, and selling more prints to people with deeper pockets. I wouldn't say photography is about gimmickry, but I would say it's about perceived value. Also, regarding digital, if a job really calls for digital (largely based on how the photos will be used, how they'll be seen), I'll do it that way, now. I find those jobs to be quick, painless, and extremely profitable (like, a headshot for a website only or maybe an interior or a product). On the other hand if the client tells me he's hanging this portrait on the wall, I can easily make the case that film and real prints (silver, alt) and quality framing are the path to take.
I am thinking about only offering matted and framed prints in the future. It adds to my workflow, but it results in a finished piece that will have higher perceived value than a print in an envelope. And, it allows me to totally control the product from concept to client wall. It always blows my mind that a print that I've sold for $100 becomes a $200 job for the custom frame shop. Seriously. Take a print to a high quality custom framer, pick a nice wood frame, pick a couple of mats and non-reflective glass, and don't be surprised that the framer makes more money than you do. Something's wrong there.
My wife quoting that higher rate was one of the best things that ever happened.
Neal