Are bonuses a mystery or do you have actual metrics that you can use to gauge whether or not you might get a bonus? Are they not part of your compensation? Who

Are bonuses a mystery or do you have actual metrics that you can use to gauge whether or not you might get a bonus? Are they not part of your compensation? Who would take a sales job that doesn't list what sort of commission they'll be getting? And wouldn't average income from such a job actually be helpful if you are deciding to take it? Sure, it is wonderful if you get commission each time you sell a car, but if folks aren't getting paid very much per year, it probably means cars aren't selling as well as the what the "possible income of xxx.xx" is saying they are. These are all things that can be disclosed and if they aren't, do you want to work in places that have secret formulas to give you pay?