Well with Andy’s attitude it is no surprise if the traders are stopping attendings jhows if he feels we should not be buying stuff from them. There are good saving to be had if you order in advance and pick up the goods at a show to save postage costs, buy from 2 or 3 suppliers and you have soon covered your fuel and entry fee, that is the way I have always looked at it. And in the days of SAE for catalogue, sent cheque with what you think postage will be, etc it was always far simpler to hand over cash which often got you a bit of a discount too.
As for connecting with people yes its good to meet people I otherwise talk to on forums or by email, often we will exchange materials etc and the odd bit on money also changes hands. A show is often part way between the two of us so makes for equal travel and as we would be going to the show anyway it’s no extra cost in fuel or time.