It's to make the die for their's!
-General Patton, WWII
I think an excellent way to implement trophies and boost gaming experience over Home and PS3 Games is, by using trophies as "gear" on our Home characters.
Suppose there are 5 "achievements" on Ninja Gaiden Sigma, some harder to get than others. One reward can be a statue (trophy) for our virtual Home place. But!, the hardest "achievement" could be the "Dragon Sword" or even the famous Katana. This "trophy" could be place in our character as "gear", but NOT to be used.
I strongly believe this idea will , not only encourage players to get all of the unlockeable trophies in a game, but also enrich our Home experience.
By letting this happen, players would realize just on the watch, what kind of player you are (amateur - pro), plus we all know it’s cool to show our gaming conquest to the world