This is a false premise. Even before ReactOS to get traction, there was WINE. From your point of view WINE "doesn't fit" either?
And people are spending their precious time in something actually useful for the entire world. They canonize a proven and currently used (in massive proportion) architecture and take it out of the Microsoft's whims. They put their time and effort in a public solution which is an alternative to Windows, yet not a sadomasochistic option like Linux & related (trying to shove down to mainstream user's throat something that was not designed for him). Finally, they do something that is obvious and had to be done a long ago, and I'm shocked how there could be people questioning the even the reason for ReactOS's existence.