A Spanish proverb says, "A horse is worth more than riches." That thought, or something very like it, darted through the mind of Steve Bass as he watched a strip-faced bay mare going around the Black Hills Stock Show horse sale ring last January. She showed plenty of style, superb action and great, light response to her owner Jamie Olson in the saddle. With Tresa and the boys nearby, the auctioneer's patter rang in Steve's ears. Quickly it reached $10,000, then climbed on and on.