IPSC shooters(myself included) hopped on the titanium bandwagon when the parts first started becoming available thru Brownells about 12 years ago(maybe more,time goes by faster as you experience more of it).Anything to make your racegun go faster. Anyway, my observation was, titaniun firing pins don't wear any faster than steel. The nose and sear hooks of Ti hammers DO wear a LOT faster than steel. Ti hammer and firing pin with 23lb(stock) mainspring is OK. Ti hammer with STEEL firing pin and stock MS is NOT OK(light primer strikes).Also, I have personally seen Ti firing pins wear thru the coils of the firing pin spring causing the spring to screw together and leave the firing pin protruding past the breech face. NEVER seen it happen with a steel FP.
Moral of the story: Shooters and bass fishermen are the biggest suckers in the world when it comes to new products.