Commission isn't the only mechanism of performance based compensation: bonuses and revenue and profit sharing (which commissions might be considered a subset of, I suppose) are also things. Equity (real equity, e.g. of a public company or profitable, stable company with a clear, real value) is another form.

Besides that, it's certainly possible to measure at least in aggregate the impact on revenue non-sales team members have, e.g. by the value the products they work on create. It's obviously not as clear or direct as a sale.