How do you make a small fortune in racing... Start with a large one and whittle it down. Just look to Hogan Racing from back in the CART days of the late 90's.
The Peter Windsor US F1 team kind of looked like a good plan from the outside. But when you dug into the overall premise of where the team was going to be located and the cash outlays they were going to have to come up with just to compete in F1, that was where it fell apart.
US F1 Team - Wikipedia, the free encyclopedia
Unless you are based in Europe (England or the Continent) you are effectively out of the loop. F1 is more of a culture than a business. Unless you have the top driver, top designer, top team manager and the financial backing to support it you are going to be lapping at the back of the field.
Mercedes and BMW both bought existing teams (Honda/Brawn and Sauber) and pumped copious amounts of money into creating top level teams with winning drivers. Both in my estimation failed in achieving anything close to that goal. BMW tucked its tail and left F1. Mercedes have gone through a litany list of top talented drivers and cannot produce a car that they are comfortable in to win a championship.
More power to Mr. Haas if he can do it and I will be glad if he can. I just don't want to see a slow car struggling to make the cut of each race. That would be embarrassing to watch (similar to seeing Alex Zanardi and Michael Andretti fail in F1.)