There are three possibilities in the project arena......
1 People lack the skills, time or the vision and are convinced it's always a bad idea and that paying for a turnkey boat is the most economical way, and certainly the most fun way. For them it is.
2 People that lack the time, money or the skills, even though they think they have them all, and thus have an unrealistic vision and get into a project which never gets finished and provides little to no on the water enjoyment, all at great cost. These are the projects the people under #1 know about.
3 People that have the skills, time and money, and the vision and the knowledge to know what they are getting in to. They buy right, spend right and complete the projects, whilst or eventually floating and using the thing. They get a boat set up the way they want it, they know their boat inside and out, and they derive great satisfaction and pleasure from the project. They do all, most or only some of the work themselves and find skilled help for the rest. They enjoy the fruits of their effort for some time, and sometimes, if they did most or all of the work themselves, they get all or most of their money back. I know that because I did it, twice.