Card Shows: Tech as a servant or master?

[BioCRN]

I rarely go to shows these days, but it takes so little effort to take notes (mental or physical) or even pictures then step away to do your research if that's what you're into.

If you want to negotiate it's generally a better starting point to come seemingly prepared rather than on-the-fly searching sold prices on the internet then starting an argument about it.

I've done this a good amount for my Mark Grace singles collection, specifically. I want to know why one of the gazillion 90s weird insert sets has a card priced at more than just the "50c-$1 value pick box" price and if I should be interested at all.