There might be a wealth of reasons why you do not use a formal/commercial PPM tool; it is likely these reasons will all be based on a selection of the following:
Your Portfolio of project seems too small to benefit from a PPM tool
Your project management function is not mature enough to consider having a PPM tool
The expense of a PPM tool cannot be justified in the current budget
The Project delivery staff do not see the benefit and will not engage in using a PPM tool
You have used a tool but implementation was not successful and it has fallen into dis-repair and dis-use
Your organisation feel their change process is unique and no PPM tool will fit.
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