Thinking of giving it up (a bit of a rant)
First to the OP. We all get frustrated with our car projects. Either have patience or just give up. It's that simple. Either you enjoy working on cars or you don't. Being able to drive a car helps with the reward of working on them. So dig deep on what you want to do with this hobby your in and find an answer.
As far as money this Mopar world has gone up even with inflation. In the late 80s I made about $200-250 a week. But was buying Mopars for ( a 69 RR $800, 65 coronet $200) and so on. That $800 RR would now cost $6-8000 now. That's a big increase. And now I'm making $500-600 a week. So yes things have gone up. On the plus side there is A LOT more repo parts available then years ago.
This is why I will only have my Dart for a Mopar. It will be the only thing I can afford. Yes it will take me years to build but it's about the journey of building the car. I also cheated and bought my 93 Mustang for a cheap toy to have fun while I slowly collect parts for my Dart.