Best way to split profits between f/t owners and p/t owners?

S-Corp.2 couples, wives own company 50/50, all profits/expenses currently split 50/50, all 4 people working hard in biz yet all have other full time jobs. 1 husband wants to leave his full time job and do the business full time. This husband will of course need to get paid a commission on sales he procures to pay his bills. He says he needs a sales commission of 50% of the company profit per sale to survive. He and his wife will then also receive 50% of the companies profits at the end of the year. This effectively gives him a 75/25 share of the profits. While this husband will be doing most all of the sales work and bringing in almost all of the income, the other 3 people will be workig on the backend (books, compliance, web design, etc...) What is a better way to get this husband his money so he can pay his living expenses yet allow the rest of us to be compensated at years end appropriately? I was thinking that as he made his sales and took the 50% commission upfront that this would be sort of an advance against his wifes half of the company. Otherwise my wife and I will only receive the remaining profits after all expenses have been paid by the company at years end minus 50%. Any ideas on how to more fairly compensate for his much needed living expenses yet keep the company more fairly split?