Unless you already know exactly what you want... i.e. Manufacturer, Brand and Model and you're going to the show hoping to get a great "show price deal" on that specific model... I wouldn't buy at a show.
There is not enough time to adequately examine, research and compare models to make the best decision at a show.
We went to shows hoping to see as many different brands and models as possible... consolidated in a single location to help us evaluate and narrow down what we truly wanted and needed. We also visited several different dealer locations and spent hours looking and comparing the features of each manufacturer.
After we narrowed it down to 2 models we revisited the final dealers several times before pulling the trigger. Even after deciding on the "one" I went back to the dealer several more times with new questions and closer examinations of various components to make absolutely certain I would be happy with the build quality.
Then the pricing research began with getting several quotes from dealers all over the country. I used these quotes to negotiate a fair price with a local dealer... who I preferred to purchase from and handle accessories, prep and any warranty work that may be required.
IMO... salesmen at shows are hoping to get the "impulse buyers"... who let the excitement get the best of them and possibly rush into a decision sooner than necessary.
However, if you know "exactly" what you want... maybe you can get a great price. But my guess is the "show price" is also available after the show. And maybe even a better price can be had... if you have done your homework and are prepared to negotiate.