It is good to know that wheels can last longer than a week.
I have a question for you JoeyBike. Why do inline skates need so many wheels? It would seem to me that more wheels would cause more resistance. More bearings also means more resistance and more weight. Why don't such skates use just two wheels? I have seen trick skates with just two wheels but they are rare.
All of the wheels are bolted to the frame rail so they don't move. There is no suspension on each wheel so there aren't any smoothing effects and traction effects that would go with a suspension. Once the rear wheel is off of the ground all but the front wheel will also be off of the ground.