3. DeAngelo Hall
Hall made a massive mistake by failing to move to the New England Patriots. The former NFL cornerback had that opportunity, but money motivated him rather than the opportunity to win a Super Bowl ring. However, he admitted that he regretted the decision when he retired.
He looked at the contract that the Patriots gave to Randy Moss and wanted the same. Instead, he stayed with the Washington Redskins on a longterm deal and Moss failed to solidify his legacy. Later, he recognized his mistake. In the end, a few million dollars cost him a legacy.