It doesn't sell it, but it does grow some for its own purposes and for a very small number of people that actually have legal access to it.
If it is like anything else in government, it's undoubtably too expensive, of uniformly low quality, and worthless for its intended purpose. Then again, who would be surprised to find the government say "our research shows pot isn't a good medicine" while only allowing research on the worst stuff it can come up with?
I didn't know that.