Although this is perhaps not as applicable, the numbers are concrete; I can share that the gamefaqs guide had 6000 hits from 2005-2009, 5000 in 2010, and recently 400-700/day. By comparison, a short math faq I did for a Grandia III mini-game topped out at 80k hits, maybe 50k of that in the first 6 months.
Edit: cleaned up my numbers
Edit 2: changed thread title











