Some articles I've read suggest that it's intentional on the part of the applicant. The idea is to extend the useful life of the patent by delaying the application's completion as much as possible.
"By April 1988, when Gould's use patent was approved, optically pumped amplifier patents covered 80% of the lasers made in the United States. The market for lasers had ballooned to more than $500 million per year. Suddenly, Gould was a multimillionaire."
Presumably, Gould had delivered a useful and valuable invention to the world and the patent sets him up to be compensated accordingly, if the premise holds.
Wow. Where I live, since at least 2005, I can choose the seats in a movie theatre when buying a ticket (even online now). Seems like a lot of prior art.
The patent in question (which I believe is 8,024,234) only covers a method for people selling tickets to compare prices for tickets across a venue in the form of a venue map. It does not describe an interface for purchasing them.
The patent thing may look laughable from the outside but inside the US it's pretty much required by how everything in business has been set up - to squeeze everything out of anyone using so-called 'legal' methods.
The legal system in the US is basically a self-feeding machine that produces crap you have to pay for.