If your sole purpose of going to a knife show is to make a purchase, you might as well participate on the forums and use the travel money to buy that custom. If it's not what you want, trade it at a loss and buy something else.
If you buy from a reputbale dealer like Les, you can always "upgrade" your purchase. Going to a knife show, whether by air, train or, car, means I have LESS money to spend on knives.
Why go then? There is the "vacation" aspect that is appealing. Traveling to a new city, eating out at new places, seeing sights along the way. You also get a chance to find new makers you didn't know about before and compare work side by side. Most of all, I like the social aspect. Knifemakers and collectors are a very socialble and friendly bunch and I never fail to have a good time when I find myself at a bar, resturant, bench, coffee table or, just about anyplace myself and someone else happen to be.
I wasn't afraid to fly before and certainly am not afraid to fly now. I personally dislike some of the service aspects of the airline industry and find my trips are more enjoyable when I drive and stop along the way to see the local sights and features instead of sailing by at 30,000 feet.
For what it's worth, I will probably go to more knife shows this year then at any time in the past.