I'm not tired of it at all. Programming ain't free, and if anyone could use some funding, it's them.

I mean, it's not like Apple's going out of their way to make Aqua work on non-OSX unixen, or systemd's going out of its way to work on non-Linux unixen. Just like how those rely on features of their host platforms, LibreSSL currently relies heavily on OpenBSD-specific security features in the kernel and userland, and it'll take quite a bit more effort to port that to other platforms in a secure and correct way.

Now granted, I'm an OpenBSD user, so my opinion on this is biased. However, it's the same opinion that many Linux-specific or BSD-specific or OSX-specific or Solaris-specific or Windows-specific or VMS-specific or MULTICS-specific or what-have-you-specific projects seem to already have: focus on your primary target(s), then help with porting efforts to secondary targets when it works well on the primaries.

The OpenBSD Foundation has actually been one of the most receptive projects when it comes to software portability. Yes, they target OpenBSD first, but they provide compatibility shims for all other platforms. In general, their philosophy is that it's better to reuse tried and tested code, rather than reimplement poorly from scratch. And their politics reflect that.