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See [news.netcraft.com...]
I could find out it seems to be an abbitious government project... is that correct?
No -- they are a small private company made of a bunch of good people from the UK. They have been around for a very long time and their analysis (that they conduct on the basis of their automated surveys) is pretty much universally respected.
The web stats in question are derived from single request to a domain name -- this is as light on bandwidth usage as it gets! While you are unlikely to see any direct benefits from their survey in terms of traffic send to you, it is a good netizen's behavior to allow this sort of activity. Indirectly you will benefit from the Net being better understood, and thus attracting more investment.
Here's where I got the info [ibiblio.org].
Not the same thing?
I might have missed something, but I failed to find references to NetCraft in the links above? And yes DARPA funds a number of projects that are not necesserily of direct military significance, I doubt they fund NetCraft however since NetCraft was around for so long that and they have established themselves in their own niche so well that they have a number of huge corporate clients that pay subscriptions on a regular basis and this should be enough to sustain their small, but very good company.
While their activity will not benefit your site directly, they are doing important PR job for the Internet, ie for us all, and since they are behaving themselves and don't burden you with cost of their activity I would personally recommend to avoid banning them.