We tried this for a healthcare Q&A site we built (under the assumption that anonymity was paramount).
We blocked spam bots the best we could, but still had issues with actual human spammers and a general lack of quality of submitted posts.
Pros: Questions submitted increased by almost 3x's
Cons: Quality of questions / answers decreased considerably. Threatened the integrity of our overal experience so we removed it.
We blocked spam bots the best we could, but still had issues with actual human spammers and a general lack of quality of submitted posts.
Pros: Questions submitted increased by almost 3x's Cons: Quality of questions / answers decreased considerably. Threatened the integrity of our overal experience so we removed it.