The timescale is one difference, it's hard to get "sucked in" in the gambling-like mindless state when the timescales are over seasons as opposed to minutes. There's a reason gambling isn't done in a correspondence format.
In human physiology/psychology as well, the chance of addiction itself is a function of timescale. This is why a nicotine patch is much less addictive than insufflated nicotine (hours to reach peak effect vs seconds), or why addictive software have plenty of sensory experiences attached to every action, to keep the user engaged.
