This is for a good job. Temp agencies often pull about 30% of the total payment for each temp and permatemp they employ at another company. And they make a profit off of that overhead.

And I don't know about the jobs at Salesforce, but I find it odd that the person you're replying to assumed an average $125k per job. That's a really nicely compensated job, even if the $125k is total compensation, not just salary.