Why is convValue stored as a decimal in the report

[tozor]

I am curious why convValue (and defaultConvValue, salesValue,
leadValue, pageviewValue, signupValue) comes back as a decimal value
in the report, when cost and cpc values in the same report are
returned as long values in the micro unit currency format. This seems
very inconsistent to me. Obviously I can convert it for my
application specific needs but I am wondering why this design choice
was made. What don't I understand??

Thanks.

Tim Ozor