I attend that show about every other month and sometimes I don't buy anything. Since my favorite 'hobby' is driving (About 24 k miles/yr --- 40 k km/yr), the gas usage and cost don't bother me at all. 
One thing I noticed at the coin show yesterday was that the U S proof (S) Sacagawega $1 single coin was  high priced......anywhere from $6 to $12 each. I've seen unc rolls go for as low as $50.