I believe it's the sound of a tactile switch, and then the sound of the key bottoming out (which is not how you should be typing). It could also be the sound of the keycap hitting the board, but to me the first two are more likely.
Additionally, for an input device you use for 8 hours a day for the rest of your career the price is trivial. Nothing is worse for me than the mushy feel of rubber dome switches.