Earlier quoted context omitted.
It’s called the Members’ Representational Allowance and is north of $1,000,000 per year. https://sgp.fas.org/crs/misc/RL30064.pdf
I am sure we could find some Members who think this number inadequate. that number could fund about 8 people's salary per year, is that enough staff to do the job? I don't know
I was trying to clear up your confusion that staff (and other expenses) were paid out of a congresspersons $150,000 salary (which is also a bit higher than that btw).