Hi Greg, Oliver,
  I'd like to provide a little context for why it is returning a rounded 
number and why it was not originally made a Money field.

When conversions were built, it was intended that the conversion value could 
represent other items aside from currency.  For example, see this 
documentation: 
http://adwords.google.com/support/aw/bin/answer.py?hl=en&answer=115794 and 
then expand "Step 1: Get the code snippet", then "See how to add a dynamic 
value".  As you can see, the conversion value is not explicitly an amount of 
money (although that is an extremely common use case).  The conversion value 
could represent "sales points" or any other type of unit.  It could even 
represent repeating fractions (1/3, i.e. .33333333333... repeating).  As a 
result, since this is a Long field, when the backend providing these values 
returns them, they get trimmed/rounded to a single decimal place to display 
more appropriately.  The reports retain this behavior because there is no 
convention for displaying a non-terminating decimal/fraction.  A single 
decimal place was chosen to be the termination point.

I've filed a request to expand this rounding to two decimal place or to 
otherwise change this field to Money, but I cannot make any promises as to 
when this change may be done.

- Kevin Winter

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