You don't describe you girlfriends position. Virgin? College grad? Age? Kids? Divorced?
My wife is 45, 2 kids and Divorced= no sinsod. She said her thai husband paid 35,000 baht. And a little gold. He was a painter at the Toyota factory. I paid for a small village wedding. Food, drink and music cost about 25,000. I pointed out this was for religious/ Buddha only. Can't have their daughter living in sin now can we.