Subpoenas

I am surprised subpoenas are not used more than they are.  I guess practicing law has made more skeptical of people.  However, it has also reaffirmed my belief that a lot of people just plain lie.  In the past I have had several cases where a party grossly misstates their income.  Through subpoenas I have been able to get documentation to show their income is a lot more than they are stating.  In at least one case, $100.00 a month turned into closer to $10,000.00.  I am getting to the point I just about subpoena anything I can get from a third party to a case because I have come to the conclusion that I can never get the exact items or a least a full copy of what all I need from the opposing party.