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I understand that no search tool is entirely accurate, but I'm seriously beginning to doubt the accuracy of the Moz keyword tool search volumes for keywords.

For example: I entered "largest police departments" and it says 0-10 per month in the US, despite the fact that that term is directly responsible for 200 hits per day. Many alterations of that keyword come up with 0-10 or not determined.

This is not a small error -- and it repeats over and over for other search terms that I have already ranked for in the US. It's gigantically inaccurate in a massive scale.

Today I was reviewing my Moz analytics and suddenly noticed 1,000 issues with pages without a meta description. I reviewed the list and learned it is 1,000 checkout pages. That's because my website has thousands of agency pages from which you can buy a product, and it reflects that difference on each version of the checkout.

So, I was thinking about no-indexing (but continuing to 'follow') these checkout pages, but wondering if it has any knock-on effects I may be unaware of?

Any assistance is much appreciated.

Luke