Agreed, item #1 is to prepare yourself for the proliferation of snake oil vendors and voodoo beliefs! People will give you a big load of BS and keep a straight face while doing it. I just give a smile and move along.
Next, prepare yourself for eye-watering high prices! And, the performance may or may not be there to justify the pricing.
The final day of the show can be a good option, as many vendors would prefer to sell the demo gear at a discount rather than pack it up and carry it back.