You are so right Sky, I’ve seen friends buy bargain boats thinking they will fix them up only to find the 30K budget grows to 100K plus. That’s if you do most of the work yourself. I have a friend who bought a 53 YF for 65K. Two years and 135K later he still has two years worth of work to do before the wife starts to decorate. That’s when the big money starts. Lol. It’s always cheaper to buy one complete.
While I am NOT going to argue that the "double the budget, triple the time" rule frequently rears it's ugly head here too, I also find the generalization you are making inaccurate.
I have several friends that have rehabbed boats that were less than "complete"..... I've done it myself.
One has a 38 foot sailboat in his shop (yes it's a big shop) It's from the 70's when they built things to last. He took it down to an empty hull. He put in a rebuilt motor, tanks, interior, electrical, electronics.... He equipped it to go to Ireland with and see his ancestral lands as he will not set foot on an airplane. He does everything, up to and including the fabrication of stainless steel hardware. The engine cost him $500 plus $1500 for the rebuild, which he did himself. He painted it and it is the fairest prettiest hull I've ever seen. The boat looks better than the Hinkley's I saw at the boat show this weekend. He built, and got street legal a 25,000 pound GVWR trailer to haul it around. It's taken him 5 years and he is still under 100K. He is on schedule and on budget.
Another bought a Dutch seventies era motor sailor. He's slowly redoing the systems in it. One at a time. Electrical, windows, paint, galley and on and on. It was functional but tired when he got it. It has been functional all along, going on five years now. We go on trips on it regularly. It now looks pretty darn yachtie. He is on schedule and on budget.
I bought a 42 foot sailboat myself, for 65 cents on the dollar out of foreclosure. Tired and dirty but not destroyed. I spend three months and 30K on it. Then I sailed it for 6000 miles and sold it in 2008 which was not a good year for selling boats. I got all my money back. I'll get a nice one... but close to 300 large for a 53 is not in my plans.
There are a lot of dreamers that overestimate what it takes to do it, and what their skills are. Then there are people can CAN do it, and have done it.......
Now I realize that if you have to paint, rebuild engines, fox some soft spots and redo the windows and a "few things more" on a Hatt, you very quickly are not going to get your money back, ever. That said, in my case that will be for the estate to deal with, or I will have gotten 15-20 years out of it and I won't care. But in the meantime I will have a boat that I will know every nook and cranny because I've worked it, and that's set up the way I want it.