Hey guys, I went ahead and implemented this. Any user over 1000 rep will have their content automatically marked as not spam. It is very rare to receive spammy posts from high rep users, and you've all been good about reporting spam and voting rings, so hopefully this won't cause any problems. Let me know if any of your content gets automatically marked as spam if you're over 1000. It's still possible for lower reputation users' content to be improperly marked as spam by our automated system; training it is an ongoing and somewhat slow process. We track its accuracy, and it's steadily increasing, but it will probably never hit 100%. It's also possible for high-rep users' content to be manually marked as spam by admins or the community, but I don't expect that to happen very often.
Anyway, thanks for all your contributions and your spam vigilance! Happy posting!