Well, I do anyway. To quote a discussion on another forum, here's why:
"A total of 35 horses have died at the Grand National since 1999. That means an average of 2.5 horses per year/race. This does not compare to any other equine event held in this country."
There is no other sinlge competetive equine event in the whole of the UK where the horses entered have such a statistically high chance of meeting their death, on the same day every year.
The stats for the whole of racing are bad enough, and there are arguably some callous practises in the industry, where the animals are largely treated as disposable commodities. But, leaving that aside for now - this race - not worth it.
(Don't tell me the owners love their horses, maybe some do, but in my experience working as a groom on a racing yard for a year, the majority think they have some great investment. If the horse is lame they are more worried about when it will race again than the welfare of the horse. They'd be lucky to be able to pick their horse out if it was in a field with 10 others and not wearing their colours).