I think everyone is saying the same thing here. This is a good case of the paradox that is the muscle car market. If you had a rusty but verified AAR or TA, you are going to ask decent money for it because it is a AAR or TA but whoever buys it needs to understand what is in store for them. Of course this formula is vastly different for different people; if you are capable of doing most/all of the work yourself that is one thing, but if you have to build the car via a checkbook, its going to be expensive and take a lot of time and when you are done you are probably underwater financially.
I don't think I ever bought a car where my initial interest was motivated by what the car would be work later, I have always bought my cars because I really wanted them or needed them. I have made money on a couple of cars over the years but have lost money a lot more times than I have made money.
The days of finding a "goldmine" are not necessarily gone but they are rare. With the advent of the internet, it takes seconds to discover what cars sell for. Everyone sees the auction cars selling for decent money or even stupid money but I would bet that if you talked to the seller, he "might" have made a little but more times than not they barely break even and many times lose. Its like playing the stock market; actually more like gambling in Vegas.