Game settings are incredibly violent places.
I do not possess any of the skills or fantastic powers found in game systems. Therefore, going into the game world would be phenomenally stupid. If I try to use my normal Earth knowledge to gain power, it will either fail because the rules are different, or some local with the fantastic abilities is going to take everything I build by force. I don't see much point to the exercise.
Now, if that portal opens on some normal world elsewhere in our own universe, the question's quite different.
I do not possess any of the skills or fantastic powers found in game systems. Therefore, going into the game world would be phenomenally stupid. If I try to use my normal Earth knowledge to gain power, it will either fail because the rules are different, or some local with the fantastic abilities is going to take everything I build by force. I don't see much point to the exercise.
Now, if that portal opens on some normal world elsewhere in our own universe, the question's quite different.