reliability of profile-testing?

i've always wonder why companies are willing to spend insane sums of money performing those personality profiling tests on their prospective employees, and also the reliability of such tests... but after 2 interviews with vestas and maersk, i must admit that i am now convinced by its accurancy...

scenario 1... the hr manager of vestas asked me over the phone interview:" according to our profiling test, you seemed to be extremely frustrated with your studies at the moment..." how true, frustration with the delay of the project was threatening to spill over at that time...

scenario 2... the hr consultant at maersk said this:" from what i can see, you are results-orientated, like to voice your opinions, empathatic, look at the overall picture when it comes to a task..." omg, i've never expected myself to be looked right through based on a few ticks on the profile-test papers...