[speed_spread]

Because sales are quantifiable and directly mapped to performance.

To get that kind of proportional payback in engineering you'd need very clear financial objectives for a project. I could see that happening in optimization scenarios where consultants are brought in and get paid for whatever they can trim from operational costs.

[cestith]

In fact I’ve seen both tech and manufacturing efficiency consultants whose quotes include $x up front plus monitoring and reporting that shows the efficiency gains. Then rather than taking a closing fixed payment, they get a percentage of the savings to the client over the first six or twelve months.