Let's be honest with ourselves here. If I had to make a guess based on the current price of addons in the X-Plane community and the prices of high-fidelity addons on other sims (*cough* PMDG *cough*) I would say this product is going to cost in the region of 70-90 USD. No more and no less. This is what the market is willing to pay and I believe it would also be a fair price for the product if it's as good as it looks like it's going to be.
I can see why airlines are upgrading to the NGs and A320s...but the Classics are just so much more involving from a pilot's perspective and there's something about pre-90s aircraft that just feels more "right". Further proof of how pilots don't run airlines (otherwise, all they'd be operating would be Boeings, and mostly 737s)