The recently completed South Africa World Cup is hardly an exception, with the bulk of the trouble lying in the gap between optimistic projected costs and actual costs:

The proposed budget for the 2010 games was about $225 million for stadiums and $421 million overall. Expenses have far exceeded those numbers. Reported stadium expenses jumped from the planned level of $225 million to $2.13 billion, and overall expenses jumped similarly from $421 million to over $5 billion.

And don’t forget the “ruins of modern Greece” — i.e., the abandoned facilities from the 2004 Summer Olympics in Athens. You think Greece might be feeling a bit of buyer’s remorse about now?