Steal comments that answer the question and post them as an answer. If it happens enough either the misguided commentators will be annoyed enough at the "lost" rep to give outright answers next time, or no one will notice / care and you'll help the community and... oh yeah, get some rep.
BTW, I stole this answer from Jeff Atwood's comment on sysadmin1138's post, so you should upvote this to annoy Jeff.