To your questions:
Are the prices too high to motivate historical buyers to leave the comforts of their HDTV? => Yes.
Will the market pick up the closer we get to the season opener? => Probably, and the correlation will be that your ticket prices will come down.
Other thoughts or experiences of sellers are most welcome. => Having used Ticket Master and others over the years, it's the add-on fees that have convinced me to not go this route anymore. Tired of being gouged. I love the stadium experience, but far less motivated to make it happen these days. Sorry. I do hope you get what you deserve for your tickets.
And when the Bills get back to Nashville, I'll join you there.
Of course, that new stadium will do the same to their ticket prices as the Bills.