parents are still stuck with illogical past cultural practices. this is true even for well educated ones as they want to preserve the tradition.

perhaps if you can have some older people from your side to talk with your fiance's parents might do the trick. if you can show them that you have saved the money and will use it for the future with their daughter, perhaps some sense might come in.

also, get close with your future mother in law, normally ladies rule the table on marriage talk. get her on your side and it will be easier to convince the rest too.

hope your marriage will start and maintain happiness forever..