In every possibly way imaginable, $25 is a complete and total insult.
I did a bunch of these for the last MSC, one that offered $75 for them. First, you have to spend AT LEAST two hours on site, usually that time is 2-3 hours. The audit is absolutely white glove, too, it took a couple audits of needing to submit zoomed in pictures of things that I never would have otherwise reported. Fortunately I had the extra pictures, so yes, you want to take "extra" pictures here. You will spend about another 30 minutes or so once home to sort through your pictures. Then, another 30-60 minutes on the report.
This was a good project at $75. That was fair compensation. $25 is an embarrassment.