Let me correct you on your assumption.
The act specifically sets out five purposes. The last two are to “encourage experienced and competent persons to seek and accept public office” and to “facilitate interchange between the private and public sector”. The second is to “minimize the...conflicts...between the private interests and public duties...and provide for the resolution of those conflicts”.
Part of my job is exactly that: making sure that the best people can get into the public service, and out of it, with the least amount of conflict of interest.