Old custom software, old hardware, vendor wants all the $ for an upgrade, we refuse to pay. I took 10 desktop pc's($500 each) replaced servers ($20k each), one usb to ethernet dongle in every pc b/c we needed 2 network ports and we had this laying around, USB3 to GB, slap virtualization with USB passthrough. They work for 5+ years, gigabit speed, 24/7 with no problems.
People should have more faith in dongles. Not all are bad.