@sunnySkys - I'm not surprised your neighbor ended up with problems. Home improvement issues don't fix themselves and the longer you put them off the worse they become!
I personally think a ridge cap can be decorative as well as functional. One of my neighbors has a ridge cap that is a different material than his roof. He painted the ridge cap to match the siding of his house and it looks great! I love when people think outside of the box regarding the way their home looks.