I think we all know that the fates of retired racehorses are sadly a lottery, but this reiterates my point that in general we should be thankful there are people out there willing to take them on, even if they are not particularly wealthy.
I agree with cormack15 that care of even a healthy horse is very costly, and also that some people will underestimate the amounts involved.
However, if someone is able to give an ex-racehorse a few years of contented retirement before mounting vet bills means that the horse has to be put down, that seems a better fate than the likely alternative.