Ask HN: Anyone used an Adwords Consultant?

I have spent a lot of time myself optimizing my adwords campaign, and used to have a monthly spend of about $5k that was getting very good ROI bringing people into my online space game, but about a year ago, I just stopped getting the clicks, and now I'm only spending about $1k a month despite my budget and the advice from the Google people assigned to advise me and any tweaks I do. I've upped my bids by several cents, but that doesn't seem to help either.

Anyone used an Adwords consultant? If you Google it, there are lots of people there ready to take my money if I let them, but just wondering if anyone has any idea if they are worth it or not.