Service cost on AP? - Just things to consider before a purchase. (input appreciated)

[onthemoney]

Hey guys.
So before I make any decision on this beautiful 15450, which IMO is a perfect fit for my wrists, I have a few questions.
I generally am very careful with my watches, and I am aware that the AP RO is very prone to scratches, and I would I assume knowing how I am, I will probably want to service her every few years. How much does a service generally cost?

I assume if there is a deep ding on the bezel, it would have to be changed. Would this literally cost a fortune?

Lastly. Would you think this is a good idea for a second watch?
First being a Rolex GMT.

Input is appreciated!