Yes it is required. Also worth noting is that if your marriage certificate is a little bit old (not sure by what time limit) you have to get some paper from your marriage building to confirm is acceptable. All in all this visa is a pain in the arse. Don't think I'll be doing that again.
You are entitled to a 30 day extension doesn't matter when you leave within that time. The price is 1900b. Why have him/she asked for extra money? Once you have filled in your forms the process takes not more than 1 hour in my experience. Don't make a scene that won't do you any favors just point out you know what is what. All done with a smile of course!