I don't recall saying a tip won't change over time. In fact, most tips play better at the end of their life then when freshly installed, IMO.
My point is, and still remains that going through a tip a month is ridiculous and most definitely user related. You raised the issue of pro players and tips, I disagreed that they change their tip according to how hard they've become over time.
If there's one thing most pro players are superstitious about it's their tip, and they don't change it according to any timeline other than how well it's playing.