I don't see any reason why should get their hope high in gambling, when you are fully aware they you winning is boils down to luck . Which means you can either win or lose . So not getting your expectation high would help in relieving the stress in gambling. And would help one to approach gambling in the right way , because most time alot folks always get their hope high in gambling because they believe they can get rich through gambling fast which may also trigger some sense of gambling addition too.
People that will put their hopes on rewards from games that is currently playing is either newbies or those that are using gambling as their main source of income. Because some take it as their main income source, they are dedicated in making prediction which they believe that it must surely be a successful bet. So, even when the game is on, they believe it's going to go as predicted.