Ok so I did the math:

Laser etched hardtack is actually an amazingly cost effective business card.

If you don't already have a laser cutter or laser etching machine, you can get one for about 100k sats. For the added cost of water, salt, and a few bags of flour, you can make 1000 hardtack business cards cheaper than the cost of ordering that many paper business cards from an established manufacturer.

That's right, your laser etching machine can pay for itself on the first batch of hardtack "ship's biscuit" business cards.