My keyword went down from 44000 to 72. The day I bought the exact match for it was a nice sunny day and then BANG! All my noob dreams have been destroyed.
Still the difference of ten of thousands in search valume is a bit shocking.
Is this a fairly competitive niche? Or a niche with a lot of action that Google has been grumpy with? I noticed a massive drop when going from the old to new KW tool, and I'm in a niche that Google kind of hates right now.
If I had a conspiracy hat on, I'd think they were artificially deflating the figures for terms that are related to problem-niches for them, and thereby disinterest potential affiliates in those niches.