All the people screeching about the Tesla Roadster flying car demo don't get it.
Nobody thinks this is going to be a practical flying car sold to the mass market, and you just look like a fool debating it.
Elon doesn't, Tesla doesn't, the engineers working on it don't, and any sensible public or Tesla investor doesn't.
They know they aren't going to sell more than a handful or them or whatever for funsies, that's why it's literally "invite only" on the order page.
There is absolutely no sensible business decision to spend 7 years working on this, they know it's going to be a negative return on investment. Heck, if they do get sold there is high likelihood it's going to get someone killed, and that's really bad for business. Just the normal rear Thrust version is probably going to kill people.
But they do it anyway for the reasons this poster on the EEVblog forum said. No wonder engineers fall over themselves to work for an Elon company.