I don't know any of the details of Maven, but I've done a lot of federal work, and there are a few very good reasons to do insignificant projects, mainly based around past performance.
In order to do any work for the government, you have to show that you have have done the work before to a satisfactory standard, and that you've done it for a type of agency similar to the one requesting proposals for the work.
So, while a given project might be nearly worthless, you do it so that you can say that you did it, so that you're eligible to do it again in the future. The side, but still major benefit of this is that it excludes would-be competitors from getting that qualification, adding barriers to them for getting similar work like this in the future.
Smaller companies, even companies that do exactly, or even only a given thing, often find it hard to get work doing their chosen thing because they don't have these past performances. To get their first qualified performance, they typically have to partner up with a larger company that has qualifications for work at the agency (think Boeing, Raytheon, General Dynamics, etc.), and do small bits of work as a sub-contractor for them until you have enough documented performance to do the work on your own.
Whether or not these particular military contracts are worth much, it opens the door for a larger variety of contracts, which can be worth tens of billions per year.