Let me explain:
Personally, I think it would be fun to see a bit more creativity when I vote in the BBAs. Because the amount of diamonds required to change the title of a film is so high, most people just resort to the default ones given over and over again. Wouldn't it be more refreshing and allow for more of an opportunity to be motivated about creating unique films if the diamond price for customizing the title of your film yourself was lowered just a tad? It doesn't have to be that much more either. 5 diamonds maybe. I mean, I'd even pay 10 more often, but 19 everytime? A bit too steep I think. So, we end up voting on the same thing we see over and over and over again in the BBAs. There are hardly any funny or unique titles. I like to be creative and work on my films to make them look good and I like having the possibility of a good film being up there in ranking with the Big Bang Awards, but my motivation drops almost every time I see that 19 diamonds just to personalize your own film title.
I know they aren't trying to restrict certain words or phrases either. That can't be the reason for having it cost 19 diamonds. If it was, the big time diamond spenders would not be able to even change the name at all in the first place.
Just my opinion, but it would be nice if it was just a tad more reasonable to pick your own names of the films you create and it would make the game a lot more fun, I think.