I really don't like using a lottery, because it assumes that everyone who wants to go to a particular concert has the same level of desire to go.
A lot of people might just kind of want to go, while for others going is the most important thing in the world. With a lottery system, each of those people have an equal chance of getting to go. It seems unfair to me.
I want a system that allocates tickets to the people who want to go the most. I know an auction type system isn't completely fair, since some people have more money than others, but it least it has some semblance of trying to distribute tickets to people who want to go the most.