Vest vending machine at SF's airport gets mocked, but rings up $10K in sales monthly San Francisco's airport has a vending machine that dispenses vests — the unofficial uniform for venture capital investors — and Twitter has been poking fun all week. But a spokesperson for the airport tells us that the machine's sales figures are no joke. The Uniqlo-branded vending machine earns $10,000 a month on average, according to Doug Yakel, a public information officer for San Francisco International Airport. (Business Insider)