I can think of several areas of the business that have changed drastically,
1. costs have gone way up for nearly everything - feed, fuel, labor.
2. medication rules, track surfaces, public attention to catastrophic injuries.
3. globalization - influence of Sheik Mohammed of Dubai for instance, US horses traveling abroad to race, and import/export of racing stock to/from the US.
4. racehorse retirement - closing of slaughterhouses in the US has focused attention on this subject.
5. addition of casino style gambling at many US tracks.
I was reading some of the old posts about the cost of owning a racehorse and I wanted to say that from 2006-2008 the costs have all certainly gone up. A $75/day rate for training doesn't seem as high as it did a couple years ago, due to the dramatic increase in the cost of doing business.