Feds charge that Jeanson Ancheta of Los Angeles cracked some 400k machines and installed money generating adware. They say he garnered almost $60,000.00. He used a trojan horse to create a "botnet" of almost 27,000 windows machines to make money.
Ancheta also set up another net of 8,700 machines and generated money from it also. He earned approximately $58,357.86 from the installations of adware he was able to set up. He earned money from adware companies with each new installation.
According to one company, his installations "fell off in January" 2004. "I don't know if he wised up, or somebody was on to him, or what." He also rented his botnets to other black hats for DOS attacks and spamming. Source