Only very rich persons can keep race-horses, and everybody knows they are kept mainly as gambling implements.
 Oliver Wendell Holmes Sr., The Autocrat of the Breakfast-Table (1858). copy citation

Context

“Though I never owned a horse, have I not been the proprietor of six equine females, of which one was the prettiest little “Morgin” that ever stepped? Listen, then, to an opinion I have often expressed long before this venture of ours in England. Horse-racing is not a republican institution; horse-trotting is. Only very rich persons can keep race-horses, and everybody knows they are kept mainly as gambling implements. All that matter about blood and speed we won’t discuss; we understand all that; useful, very,—of course,—great obligations to the Godolphin “Arabian,” and the rest. I say racing horses are essentially gambling implements, as much as roulette tables.” source