- Did you attend as a TCA member or a guest?
Just paid the money and joined. Its the price of a boxcar.
- Are used items priced better than they are on ebay/stout/etc.
Maybe? People can ask whatever they want. I swear some people just have tables at york to show off what they have, and dont price it according to anything founded in reality.
- How well are modern Lionel/MTH/Atlas items represented in the show?
Well enough to fill your trunk.
- Do bandit meets present better/different/special deals... or are they just an opportunity for people to sell stuff without having a table in the York meet itself?
Never been to one, so I defer.
- Which day presents the best deals?
If its a really good deal, its gone by 12:15 Thursday. Then, after 2pm Friday for the stuff people dont want to take home.
- Is everything picked-over by the time Saturday comes around?
Not everything, but you're definitely dealing with "leftovers" by that point.
- Does anyone come with a "shopping list" of specific things that you are looking for?
Absolutely. Then throw it out the window the minute the halls open 
I usually bring a list for layout supplies and doo dads, not trains. It also pays to have a list or a self-emailed file of things you have, especially if you're looking to find something that completes a set (i.e. you have -1, -2 and -4 so you only need -3).
- How diverse/ wide-ranging are the items that are being sold? - Are they more common items or are they items that are not regularly seen on the second hand market?
You just never know what you're gonna see. Sometimes you feel like you couldnt carry enough money, other times you spend $18. Its part of the allure.
