I replace a used broadhead after each kill. Perhaps if I were killing 10+ deer/animals a year with a bow I'd reconsider, but that's not the hunting I currently do.

If there is any damage? of course I replaced a damaged BH, if it were only to the replaceable blades, then I'd consider replacing damaged blades with fresh ones, but I certainly would not be using anything thats damaged...

How many deer/animals do you take a season with a bow?