TXstang84 and I have already given you enough facts. Ignore the whole "This guy's wheel fell off" arguement and just focus on the facts we gave about how the forces are acting on the lugs and how they are amplified through the cheap spacers.
I've even offered my solutions to the problem to prevent losing a wheel. Sometimes flukes happen and people snap 4 out of 5 lugs off and are fine. But do you really want to take that chance.
I am a mechanical engineer if that makes anything i've said carry a little more weight to it.