People are using them in various places instead of the original ones.
Both the groom and the bride might have a busy schedule for which they do not get the time to apply for their marriage registration.
Since both of them have a hectic schedule at work, it becomes increasingly difficult to plan out their wedding correctly.
Another reason to opt for the replica of the marriage certificate is that foreigners get married to the locals to obtain permanent residency within a respective country.
Suppose you are currently experiencing such a situation.
In that case, the fake documents of your marriage will surely help you, as they will allow you and your partner to proceed with the application to obtain permanent residency.