you have to remember this was 1998, and apple was the first company going all-in on usb for peripherals, using it to replace the aging apple desktop bus.
the cost concern also has more to do with low end machines in that time frame. if the connector included it, then any devices that used it would need usb support. at a time when usb was still brand new, and most pcs that had it shipped with controllers that only supported one or two ports.
As a consumer, would have been pretty cool if DVI carried USB too.
Instead, almost every monitor bundles a USB hub that needs an extra cable. Not sure how that saved manufacturers money.
you have to remember this was 1998, and apple was the first company going all-in on usb for peripherals, using it to replace the aging apple desktop bus.
the cost concern also has more to do with low end machines in that time frame. if the connector included it, then any devices that used it would need usb support. at a time when usb was still brand new, and most pcs that had it shipped with controllers that only supported one or two ports.