I totally agree. I'm a retired builder who is struggling with the same problem. Fortunately, we are in the prepurchase stage at the moment. We are looking in an area that's been on fire for the last two years, and the kind of homes we want are selling in days. We just got back from a showing of what could be a fantastic mid-century ranch, on a lot that's flat, and three times the size of most in the region. The problem? Well, it's a time capsule. It was built in 1961, and well maintained since then. However, it still has every original feature, most of which need replacement. The outside needs the sidewalks, driveway, all windows and doors, gable end siding, soffit, facia and gutters replaced. The roof is due in 5-7 years. The inside is all hardwood floors, that need refinishing, and the kitchen and baths are original, ugly and worn out. Even then, it has some layout issues on the main floor that are unresolvable without stripping the place back to a shell. Most buyers in this market expect to see a finished basement, which it doesn't have at the moment.
It's priced at 80% of what it would sell for if it was totally flipped, and I fully expect that it will under contract by the end of the coming week. That 20% difference would be my cost, with hundreds of hours of ass busting (uncompensated) work, over a few years, a small amount of subcontracted work, and the material invoices. Bottom line is that, a few years from now, I would have an awesome house. I will have invested hundreds of hours of labor that I will never recover, and the place would be a great bargain for the next guy. That just doesn't add up, by my calculations.