That is a common way to make the wiring safer, but obviously, not the best. It probably would have taken a lot more time to figure out which outlet was the 'first' one in a chain so you could limit the use of the GFCI receptacles, so it does make some sense to do it that way. Some (not many) things really should have an equipment ground, and a GFCI won't work as well as a true grounded circuit. Take a surge suppressor, for example, no ground, you've disconnected a lot of the ability of the thing to protect your equipment. ANd, looking at it another way, the ground is a secondary safety that is potentially needed to cause the CB to trip. The GFCI can fail, and without the actual ground, you could have a problem, but the CB may not trip. WHen working, though, the GFCI will provide an increased level of safety, and allow some things to be plugged in. Each one should be marked indicating it does not actually have a ground connected.