Skipping is really all about "error correction" done on-the-fly by the units proccessors.
Some high-end units use different ways to do error correction. And even the result of a real glitch in a CD datastream may cause some players to 'mute' and some to squeeze out some noise with the hope you don't notice it isn't the 'right' sound.
Guessing, I would hazard to say the highend players assume the discs will be pristine, and are geared to sonic perfection, and correctness,(in the decoding, as that proccessing has to be done in 'real time' and what the maker of the machine wants to focus on) rather than just spit out 'whatever' to make up for scratched CDs.