How is the number of employees relevant? The point is the massive hypocrisy and inconsistent enforcement. Personally I think the $10k SAR threshold is stupid, it hasn't been adjusted up for inflation since it was put in place in 1970 when an oz of gold was $35.
Internally I am sure they are filtering them somehow, likely ignoring lower amounts, but why would the government voluntarily increase the minimum? They would then have less data. Better to just collect it all and selectively use some of it.
Sure, it's better for them if their goal is total financial surveillance. It's not better for people who care about financial privacy, and it makes a mockery of the rule of law when laws are enforced selectively in secret like that.
Not really surprising that increasing numbers of people would just stop caring about breaking such laws.