Interesting ticket demand and sales were somewhat higher in 90 than in 88. In 88 the erosion in ticket sales had already started. On average there were 550 unsold tickets/game that season and playoff tickets were so easy to get. That was for a SC winning club that was carving through opposition. The radical drop in attendance occurred a few years later but it was already in the mail.
A historical graph of the yearly attendance for the Edmonton Oilers [NHL] of the National Hockey League.
www.hockeydb.com
Really the Oilers lost their dynasty collective of players the moment that salary disclosure was occurring. Paul Coffey led the way and the others would surely follow the buck at some point. Really it was amazing most of the crew stuck around for a few years after Gretzky and Coffey had left.
This market wasn't big enough that you could have ticket sales to see crumbs like David Oliver on a PP after seeing the greatest team on Earth. It was predictable that revenue would collapse post dynasty.