Maybe this post is going to be some psychoanalysts dream, but is there anyone else out there who finds that once a goal is achieved in a game such as an MMO for instance, then that game loses a lot of its thrill ?
A good example is hitting the 8.0 standings to use jump clones with a corp - you spend weeks and weeks with a goal, focused on getting it, and once you do finally reach it, you get this gigantic anticlimactic 'meh' feeling as if theres nothing decent to do with your time now, and struggle to adjust to the 'nothing new to do' mentality.
I find it happens a lot with single player games, you go through to get the best gun, or whatever, and then all enthusiasm for a game drops off the map for me... I've got dozens of games out there that I just stopped playing, in fact I've only actually successfully completed about 5-10 games in my entire life from a catalogue of hundreds.
I know this sounds a bit strange with the whole 'goal related achievements mentality' thing but I usually find that theres something new came along that I want to try after I hit the 'wall' in one game and monotony has set in, so I very rarely see the end of it.
I suppose thats why I quite like MMOs too - theres no real goal to it other than constant improvement, so even if I do get a short term feeling of depression that I've achieved a goal, theres always other players/friends to spur me on and give me other suggestions for things to turn my hand to. In conjunction to there being no real 'end' of the game until the servers are switched off, its a good excuse to pop in and out as the interest waxes and wanes.