Yes, Well said Mike,
Usually, when posible, I like to keep with the original ferrule material when replacing a cracked ferrule, but I often replace ferrules that are perfectly good, just because someone wants either a harder or softer feel. I usually try to do that with the tip, but sometimes that's not enough, and they want to change the ferrule too. I get alot of people that say their cue hits too hard, and doesn't grab the cueball well. Some even say they want more of a meucci feel

For some people a switch to a triangle tip is enough, for others require a softer ferrule to get what they are looking for. The last person I had like that wanted a softer tip and ferrule, but from what I was reading from him, I thought the tip change would be enough, so I suggested He only change that since the ferrule he had was still prefectly good, and then if that didn't work for him, I could still do the ferrule too, if that's still what he wanted. Turned out he was very happy with the tip change alone, and the fact that It saved him a few bucks.
The saying different strokes for different folks, definatly rings true when It comes to ferrules and tips, and alot of changes in feel can be made in that area alone.

It just depends on the person, what They like, and everyone is different.
Greg