An OEM Windows 7 disc is under $50 at Amazon now (down from $80 which is what I paid a couple of months ago). At a certain point, why not just buy the real thing and not have to fuss so much about compatibility? Almost every recent Mac can bootcamp Windows now, and Linux can also dual-boot, or else maybe install it to VirtualBox. That's also why I've stopped updating my Crossover for $40 every year or two. Basic lapt…
I'm not sure it's entirely clear what you can use an OEM Windows disk for. Isn't that just for new hardware? And that's at least 50/vm if I understand things. The thing to compare reactOS to is probably a datacenter licensed copy of Windows server. Productivity applications will (mostly) run in Wine - I don't think anyone expects ReactOS to be a viable alternative to bare-metal Windows install for gaming.
[1] = http://www.howtogeek.com/197232/microsoft-is-misleading-cons...