One of the teams in my league got $1.6 M for Pericle Sinibaldi (
(10074237)) a few months back. Tremendously impressive.
As to the original poster- I'd only recommend buying those 34-35 y/o guys as complementary pieces to an already-solid team you're trying to get over the hump, or as players if you need to get to the salary floor, as they're less expensive. Otherwise it just cuts into your profit for a time you can actually use it.