Most Lexus dealers won't even lease their Certified Pre Owned cars, it just doesn't work out. You could almost lease a new ES for what you would pay to lease a CPO one from Lexus (You can lease an ES300 for under $400 a month). The Money Factors are just all out of whack for the used cars. Plus, why lease something older that you might have to put some serious cash into (tires, brakes) when its not yours? The allure of leasing is you geta new car every 3 years and you never have to do any repairs, plus the tax benefits if you qualify.
I think what Jrag is saying makes a lot of sense. I see a lot of people on here buying 10, 11, even 14 year old cars and complaining about vibrations problems, worn mounts etc because "Its a Lexus and it should be perfect". 14 years is an entire lifetime of use, people expect too much from these cars.