Games like Friday nights, Alcatraz playing, the longer it goes many get on the bandwagon, many change channels, like it or not.
Before Sunday racing many clubs raced Friday, or moved to Monday when All Black's played, reason being racing was on a hiding to nothing, that's kind of sorted itself with Sunday Racing, night Rugby, don't underestimate the drawing power some sporting events like Friday draw, and as many bets are only placed in the last 15 minutes, so if people switch off you see the result, if that's not the case then a 60000 mares race at Addington pales into insignifacance as opposed to a country cup race at Oamaru on a Sunday afternoon, it's just the way it is.
In it's own way it shows what happens when 2 networks on TV have news at the same time, one strangles the other, but both dont maximise their audience who wants to watch 2 bulletins even if you can watch one on delay?