I'm never one to invest too heavily in a reliever, unless it's a premium closer type and you expect the team to compete for a playoff spot. But I think you are forgetting the context at the time of Riske's contract. Right or wrong, the feeling from Yost and Melvin was the 2007 bullpen lacked durable, rubber armed types who could pitch multiple innings or back to back days. And they didn't have the classic "set up" guy. Shouse was a one batter pitcher, Wise couldn't pitch every day, Turnbow wildly unpredictable, you never wanted Spurling in a game that mattered, Cordero was a free agent, and Villy was penciled for the rotation. The bullpen had gaping holes with only unproven McClung and Stetter around to vie for spots. The bullpen was a pressing need. Sometimes you have to overpay to get someone's attention or to quickly address weaknesses on the roster.