I had to write software that sent updates out to retail outlets. I specified they should use internal modems capable of at least 9600 baud. Customer replies "

I had to write software that sent updates out to retail outlets. I specified they should use internal modems capable of at least 9600 baud. Customer replies "Your salesman said we only needed 2400 baud modems" - and buys EXTERNAL 2400 baud modems to save £5 per modem. (Different budget to the phone line you see). Of course now you had to rely on the retail staff to have left the modem plugged in and turned on. (Which they often didn't). And the transmission time increased so much that we had to build in additional compression (and complexity) to try and ensure it finished in time. Why employ technical experts if you're just going to ignore them?