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Entirely team dependent. When I was at one of the mentioned brokerages as an analyst I had a very low salary ($40-$50k) and then was given a % of the commissions earned by the team. As part of a small team I got 10-15% of the net commissions which can add up to quite a bit in good years.

I also got an offer from a competitor (another one of the firms mentioned) and they had a larger team and the comp started being heavier on base, less on bonus ($85k for a 2nd year + likely the $1-2k per deal as the other poster mentioned). Bonuses in my experience are paid out by your team and the firm has no say in this. Basically whatever you and your team negotiate.

Not entirely sure about the logistics between the firm and the brokers (who are typically contractors), but I believe they are given a set budget for support staff (analysts, marketing, etc.). So if they are a consistently high producing team, the firm will give them more budget to staff, meaning they can offer a higher salary. If the team is relatively small and maybe not the top team in the market, the brokers have to give some more upside to their support staff in order to entice them in spite of the low salary.