Dee Oo > IMO, it all depends on how involved both families are. For eg, the parents are to decide on having a customary wedding, most couples who agree to it, would follow through, meaning getting married on auspicious dates, GDL, an chuang, dowry, tea ceremony, banquet, etc.
Parents with offspring who are getting hitched, should have some idea of the financial status of their children, since i believe the couple has been together for some time, and both sides of the family would have gotten to know the couple and accept them as family members. Whether or not the dowry of A$50000 goes to you & your hubby is beside the point. Matching the A$50000 is also beside the point.
The issue is "can your hubby and his family afford the dowry?" if yes, all well that ends well. if no, then i don't quite understand why your parents would be asking for an amount that their future son-in-law cannot afford. I'm sure they have kept in mind that both of you will be the ones who join the 2 families through your union in marriage.
Every couple would go about planning their wedding differently. Sometimes we all can get so caught up in the whirlwind which may result in some unpleasantries along the way. It's good to sit back & consider issues carefully again. A wedding may take months to plan & execute, a marriage would take an eternity