When I browse my app history on the Google Play website(of apps that I have tried out in the past but aren't currently installed on my phone), it only lists them in alphabetic order until about 'L'. Nothing beyond that is shown. Does it have a hard limit on how many previous apps it can show?
It stops for me as well, so I am lead to believe that it only stores so many in the database.
Looking at it, it seems to be limited to 20 pages (it doesn't even get to 'C' for me).