Most old timers of turbo are not willing to spend the current rate of turbo inflated prices. Also, most of us here are not sitting on a mountain of turbo games. Well some are. Esteban mainly.
I had a medical situation some years back during which I needed to sell off part of my collection in order to fully cover the bills (games which were acquired during my middle school/high school years, and across many systems other than Turbografx), and many of those games meant a great deal to me. (Also, I had a certain roommate who was...shall we say...less than scrupulous...about other people's property, and who accounted for another percentage of losses.)
Now that I'm going back and recollecting, I'm finding that the market has skyrocketed in several cases, but for a few games like this one, I can manage it. That's all it is.