Why can't they use an emulator?
OpenBSD is a Unix-like BSD-based operating system renowned for its security.
This security means it can be very unforgiving of even slightly ill-behaved programs - both applications running on OpenBSD, and virtual machines OpenBSD is running on.so they could spend a lot of time tracking down bugs and performance/portability problems that don't actually exist, and are just issues with the emulator/virtual machine.OpenBSD doesn't work properly in many virtual machines, because it puts quite a lot of strain on the quality of the emulation.
So only file bugs that you've seen manifest on a physical PC.
http://openbsd.org/donations.html. Since they're desperate for money at the moment, they're quite keen not to involve a middleman who needs paying.
It would give them more publicity, but to be honest now that it's been posted on slashdot I'm not sure how much more publicity it would get them.