ROI
When you think that if you are paying someone 50k a year that equates to 24 per hour even without any of the extra costs. If they are responsible for 500k of revenue that means they have to bring in 260 per hour. Every additional minute spent producing a quote costs affects your sales budget.
The increases in productivity are consistently at an absolute minimum over 20%. i.e. Corporate Express Technology division reduced average quote time from 36 minutes to 4 minutes. Brennan IT increased quotes from 3 people producing 148 quotes to 2 people producing 225.