I remember that you had the standard risk to pay upkeep for the weapons you spawned with the following round.
I am literally 100% certain that this was the case back when you survived a round, or was alive with a looted weapon on siege at the end of round.
I don't even recall when this was, but I do remember that I thought to myself:
"Wow! Is the upkeep for a katana that much! Damn, I won't ever be able to play with a katana and make money"