There are likely lots of second-order effects here, so it's hard to tell. The engineers may have been better rested and thus able to deliver more quickly and r

There are likely lots of second-order effects here, so it's hard to tell. The engineers may have been better rested and thus able to deliver more quickly and reliably thanks to a sense that they had an effective peer support group. The eventual product quality may have been higher thanks to the additional oversight, review and input - leading to increased market demand. The support, stability and resulting confidence offered to employees may have spread via word-of-mouth to their familities, friends and extended networks, increasing marketplace faith in the company and trust in the product. And, perhaps the simplest albeit least thought-provoking explanation: perhaps the additional 40% engineering salary overhead did not have a significant impact on the company finances.