"Cash is King" is (in simple terms) about the balance of capital, monies owed and fixed assets. So if my business has £500 in the bank, £50,000 owed on outstanding sales invoices, £20,000 owed on outstanding purchase invoices and a property worth £250,000, it's "worth" more than your business that has £50,000 in the bank, £5,000 owed on outstanding sales invoices, £1,000 owed on outstanding purchase invoices and a property worth £100,000. But most people would probably prefer your situation to mine, all things being equal. I would!
It
isn't about taking/using bank notes rather than card payments. One of my petty annoyances