I could be very wrong as I haven't been to Expo in a few years, but my initial thoughts would be:
- Most vendors likely don't have cards from those sets because they are older sets and not higher-end/"wow" kind of cards
- If they do have the cards, they are probably in an unorganized box
- As nice as it would be, most vendors probably won't go searching for these cards later to be contacting you
Your collection is awesome and it's always cool to see new additions, but just from personal experience, I'm not certain that Expo will be a place where you'll find a lot of success.
