You do know the Navy SEALs weapon are Speciality, and each individual weapon are custom to their liking, you don't just pick up a government issue M4 and use it if you are a SF member.
They like to "recycle" their weapon because they know they are set and ready to go. If you care to read the reference you supplied you will see this paragraph
The problem is that those weapon have customized barrel, customized handguard, the bolt are retracted and the ACOG are always zeroed. It's not about how much money you put in it, but how much work.
They are asking to keep their weapon if they are not active. Which would be a big ask, well, they wish. Even each M4 does not cost the government anymore than $1200. And never try to mess up SF weapon, you will be out there doing 3 hours airborne shuffle.
Another reason why they don't have enough "weapon" and "ammunition" to go around is basically they use them all in battle, and also the SOCOM community have expanded 200% over the last 10 years, and they are still getting the same budget over and over.
And finally, always spell with Capital SEAL and small s, otherwise you mean this
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