To be honest while this may happen and may start to happen more in the future it's not really a major concern for me. I will go to tournaments for a variety of reasons but winning it isn't one of them. Sure it would be nice to win but to me it's not important.
I have also never come across this type of behaviour, at least I think I haven't, and everyone I have met has been cool, open and willing to talk about the game and give tips etc.
Also, the type of player who is competitive and looks for any advantage isn't likely to be paired with me after the first round. I tend to end up on the bottom tables with the casual players and newbies.