Unlike other events in high demand, Bayreuth does not raise its ticket prices to astronomical levels (you pay $200 for top seats, quite reasonable compared to the Met or ROH). So there is big demand...
Perhaps, but it isn't likely. Minor errors are just that, minor. If it is a substantial error, completely wrong license or name, it might be thrown out.
Ticket brokers purchase tickets as season ticket holders. They increase inventory based on demand. They have a series of other undisclosed connections as well to increase inventory at the last...