I really doubt they've "made no effort to lock Ben up". (I realize you're just saying it seems as if that has happened). Mark Attanasio made a comment early in the season (or maybe it was during spring training, I can't remember), that he "expected Sheets to test free agency, as that is his right." I would guess that means the Brewers did try to make an effort, and Sheets basically told them he wasn't going to re-sign before the end of the season, and weighing other offers. The other possible scenario is that the Brewers have weighed his injury history against other options, and decided that Sheets will probably be too expensive for them. I think it's more likely that Melvin has talked to Sheets, and found that pursuing a contract extension at this point would be a fruitless effort. Again, we have to remember that contract negotiations are a two way street. The Brewers can make all the offers in the world, but if Sheets isn't interested, what's the point?