Exactly... not to mention they're only like $15 online. Why not?
Because as a matter of principle, the E-4s/5s actually carrying those weapons, shouldn't have to spend their money on gear.
Because ships don't have the ready ammo to spare to just set aside mags for an indvidual team member.
Because if I were that E-4/5 I'd rather spend that $60 on gloves that fit right so I don't fall off the ladder and get chomped on by the great white that's been following my RHIB over to the ship.
VBSS =/= SEALs or Marines.
For the typical VBSS tasking, you look like an over the top gear queer with the standard kit as it is. I don't need to look like a fuckin MAGPUL billboard while I'm at it.