Does having privileges in the cong mean you will have a successul marriage?
No.
Just ask C.T. Russell, and his wife Maria Frances Ackley. Many "privileged" marriages have failed, or never married because the couple was exposed for premarital fornicating.
If privileged marriages in the org appear to endure longer than other marriages, it is probably due to the fact the privileged couple put on pretenses to keep up appearances so as to protected the beloved privileged status.