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$800 commission for a $50/mo life insurance policy. You have to pay the commission back if they cancel within a year.

Can’t really offer a source but I heard it from an insurance broker personally.

It's generally quite low, but it depends on a large number of factors, and varies a lot market to market. It's generally a couple percentage points of your monthly premium, per month.

An agent generally needs a couple hundred paying policies to be in the black.

10% or so to the agent. Everyone makes money on the renewals (your "book").

You can make a guess based on rent and salaries. Those aren't amazing businesses, probably the median one nets a few grand per month.