I am a User Experience Architect by trade (I work hard to make the interface between humans and computers as painless and delightful as possible, both on mobile and desktop experiences, usually in the ecommerce and internal website areas). Using that ticketing interface makes my brain bleed. The entire Oshkosh buying experience (camping, show tickets, the whole process) is Not Good. It needs a complete reworking. It would take time and money, but would ultimately result in a significantly higher conversion ratio (people that enter the process and actually spend the money).
So... just know that you aren't the only one.