Summary of benefits of having a spouse reach emerald: 

They can put volume through their spouse so they can double dip on the team cycle bonus.

Both spouses receive customer leads by being emerald. Also, let them know that they want to sign up their spouse as soon as possible because you never know when a super star will come into your organization. Your spouse needs to sign up before that super star signs up not after. This will benefit both your business centers (you and your spouse) not just one.

You can also do this with your mom/dad/brother/sister/boyfriend, but granted you would be forfeiting some of your commissions.