Will
I work with Discovery Channel as a writer, over various publications, and I have seen quite a few things get buried. In fact, a big part of that was anything that was considered "liberal." If you recall the whole Digg Patriots thing that went down, my digg account (jerryjamesstone) was one of the accounts that was targeted because I submit a lot of green news. Not just from Discovery but from many "trusted" sites.
I consult for over 12 different publishers total and I have seen this behavior happen quite a bit. Now, I fully understand your concerns about spammers. I myself do not want to see the Digg front page taken over by spam. It seems logical, no, that by letting us know of a bury via the API is not anymore info than what they could get from the site themselves.
I would think this wouldn't help them reverse engineer the algo because they would not have the bury counts. Or am I missing something?
Thanks for your consideration!
Jerry