Some pay nothing, some pay a great deal.
I believe it is something you have to talk over with your girlfriend, she can then go back to the family and discuss what ever figure you came up with and either get a thumbs up or thumbs down.
Listening to the many varied opinions on this subject may well cause you a great deal of conflict and heartache so I suggest this is something you sort out yourself.
No I would not post pic's if I was taken for a ride
I may have related certain pitfall's had I experienced them but nothing more general than that.
Beware, Thai's take slander and libel very very seriously
