I believe most of trophy hunters and trophy boosters need online trophies from every games, they tried to find other gamers who boost same game and they gave up to try recruit more gamers for boosting like the ranked match requires 8 players in Warhawk and the ranked match requires 4 players in SOCOM: US Navy SEALs Confrontation. It is not just cheating if the gamer own least two PS3 consoles then they can make their own dummy accounts for bring their dummies in the online matches and the dummies are just afk, they just need to get platinum trophy after they earn all of online trophies in only ranked matches.
For myself, I own two PS3 consoles, one is my main account and other one is my dummy account. Lot of the trophy boosters interest me more than other gamers who own only one console and other gamers are offline or refuse help. Like I boosted with another trophy boosters and my dummy for Section 8, Red Dead Redemption, Crysis 3 and SOCOM: US Navy SEALs Confrontation then it made them happy for that. My dummy account doesn’t need to get any trophies, my main account does.