Re: Informix to Postgres ...
500,000 USD to 1,000,000USD
Equates to around 2 to 4 top-notch DBAs for a year so you were saving money from the start. Of course, a full analysis would cover what compromises (say reports), if any, you had to make and whether you got any additional benefits.
Most of the work I automated with python (Hey, I'm a lazy programmer / DBA - what can I say ...)
But that's the best kind. The beancounters love automation but they often don't understand the kind of people it takes to get it.