Not everyone is driven by a business case. Some people want to help feed the poor, some just want to tend their rose garden all year long, and some want to provide a compatible but open source alternative to the OS provided by Microsoft.
a project of this scale needs proper funding, otherwise it would take forever (which actually seems to be the case).
the guys are building a competition to Microsoft. Some may do it for the pleasure of doing that, but I see it as a dead-end, as there is no business driver.
if I try to think as a typical Windows sysadmin, I would just use Windows. For those guys, ReactOS is not bringing any benefit, and they will for sure work with a product that they know already. They would only see ReactOS as a source of unpredictable problems and costs.
