That's surprisingly affordable even for average Joe SWEs in the valley. I can see it being useful for when paperwork gets jammed in the USCIS pipeline for instance.
If I ever have a dispute with some bureaucracy, I will definitely do that again as perhaps a 2nd or 3rd step - it's about similar in terms of cost to retaining legal counsel, and I have to imagine a letter from a congressperson would open a lot of doors.