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Massively Multi-player Online Role Playing Games (MMORPGs) have become rather popular type of online games which include a larger number of players that play together or against each other. In order to increase artificial intelligence of these kind of games one of prerequisites is to determine a model of different players' behaviour which would enable the creation of suitable intelligent agents that would facilitate better communication and more logical cooperation between individual players in order for them to achieve the game's goal more quickly and more efficiently. In this article a research about selected aspects of MMORPG players' behaviour is presented and its results are elaborated as a part of prerequisites for creation of appropriate intelligent agents for facilitating better cooperation between players which is described as a part of future research.