The need to find a new virtual world that i will thrive in there, explore it and learn from it. I research a game and when I read reviews and see videos, if I feel that "thing" in me saying this will be fun then I know this is a game I will buy. from technical specs I admit that a nice presentation, good story telling and the existance of demo or beta are more important to me than ground-breaking graphics.

I dont think i need motive to buy a game u like   i buy games that i enjoy playing first i try it check game lore then if i like it i buy it  

First An awesome Unique Gameplay, Major Improvement in Sequels and out of the world Multiplayer experience just like Mortal Kombat X, Epic Story line and Graphics like Witcher 3
and Graphics!, Iceing on the cake    

I always think abaout the work involved in producing a game!

I whould purchase a game to try new stuff , i really like beautifull looking games that i could max out and look insanelly good , but I also appreciate games that doesn't involve too much FX but have a great story , mechanics , gameplay. I really like to try new stuff. Thanks Kinguin !

Single player story of course and supporting the developers. For example Witcher is polish game, im polish and I want to give them my money for awesome game.

Having the eye on it since it was announced and a good price

game mechanics and single player story. Tend to skip games that focus too much on multiplayer as that doesn't really interest me most of the times and those games mostly lacks proper single player.

Honestly, supporting the developers. If a game is good I will buy it almost only because I want to show my support and to encourage the developers.