Most of us have seen a recent wave of G&G guns in the wild and just about any out here has had an issue and died in action. For example your selector switch will snap off at just the wrong time and you're left with a dead gun for the day.
Now if you're savvy you'll have a backup so your day isn't ruined and you'll be able to take that thing home and fix it up. If it's your first gun and you poured every penny you had into buying it then you're out. You don't know how to fix it, you can't afford the parts you broke, or you can't afford to pay someone who knows how to fix it.
So you wind up in a much worse spot than the guy who paid a few hundred bucks more and had to wait another month before he could play.
Airsoft, where nothing is hurt but feelings.