People can resell them for as much as they want (although not always legal). If it's a GA show buy the cheapest tickets you can find and get in line early. It's worth the wait to be up front.
Not sure if this addresses your question but the bros often tune down a half step so if you are trying to play along it won't sound right. Put your capo on the first fret, tune your instrument, then...
It's easier than it sounds. Playing G (with middle finger on top string) move your index finger down one string. Play the note then pull off your finger to play the second note then play the fourth...