For AT LEAST the last 5 years, they've been saying it was the last show for one reason or another.
They downsized to a venue less than half the size as usual, because it was cheaper, and for the first time in many years it was run by a different organizing group, so less space = less room for spectators = less room for cars = less money
Also, the place was pretty much a packed house. They really couldn't fit many more cars in there, so that can't be used as an excuse.
Not saying it isn't possible, but the same rumors fly every year, so you can't believe everything you hear
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