Because you put your opinions across as facts, and they simply are not.
For instance 3000 watts and 4000 watts is meaningless except to tell you how much electricity they use. That is complete nonsense, the wattage is your airspeed, forget all this LPS it is rubbish, nobody knows who or how they were tested.
A 3000 watt will have more airspeed than your 2400 watt machine and so on. I have a tester which tests airspeed and I have tested Karchers, Numatics, Nilfisks, Vipers, Stars etc of all wattages and it always shows that airspeed is regulated by your wattage.
And that is just one example.