Unfortunately there will be players out there who want to remain in control of their games. If you'd rather sit there duplicating weapons or selling stuff, or boosting then that's your business to play the game how you want. The first Dead Island is such a game that had certain exploits people took advantage of, and the second one is no different.
With seeking out random players to get a game with, you'll potentially come across people who don't won't you screwing around behind their backs by extracting the story before they can. It may be rude, but they do have every right to kick you from the game if they don't want you there. What you could do instead is create a thread about Dead Island: Riptide in the RPG section (this is actually not a survival-horror game) and ask for people to play the game with the way you want to, with story in mind.