exactly and neither interest me at all. In my eyes replay value is down to wether i like the game or not. At the most ill try it on a different difficulty to see what its like. but im not going to "kill 500 enemies with weapon X" or "defeat X by using X" and then tear my bloody hair out trying to beat something on the hardest difficulty just to get bragging rights. Who to exactly. Youre in the pub with youre mates and you go, ive got platinum on 6 games.....aaaaaaaand? No thanks ill enjoy a game for what it is, and ill replay it if i like it. Each to their own. If the idea of collecting hidden items or ticking off boxes saying youve done this is entertaining to you then fair play. But for me im happy just to play a game at the highest difficulty level i can without it annoying me (usually the second highest or normal if theres just an easy,normal and hard).
As for replay value. Thats one ive never understood either. People say things like its one of the best games iver ever played but its got no replay value? Eh what? Would you say that about an excellent film. No youd happily watch it again and again because you love it. Im the same with games. If i love the game and its story ill play it again for that reason alone. Its just me i guess, ill never understand it i suppose. But ive never been a big online multiplayer gamer either so i suppose those kinds of things make more sense then because you often unlock things for it etc etc.