I would say track it every time and let Episerver correlate the requests. Keeping records of tracked requests on the server, to decide whether or not to track a request, usually gets overly complex.
Besides, the number of times a visitor loaded a page can also be interesting for targeting for some scenarios.
I have just started exploring EpiServer Profile store tracking and still doing research on best practices. However I had this question, do you still send tracking request for a page if user visits a page multiple times or track it just once.
What would be the reason to track every time user visits the same page.