That depends very much on which site(s) you play at. There are a few sites which do not write tournament summaries or any prize information, and some do not write buy-in information either.
Check the appropriate Site Configuration Guide(s)
and make sure that you have enabled tournament summaries if your site provides them.
If you think the buy-in and/or prize information is included in the hand history or tournament summary files that your site is saving but PT4 isn't using that information then please attach
some example files to a Support Ticket
so that we can take a look for you.