Willie Espinosa became the highest paid IFA in season 6 with a bonus of $18M. Possessing decent pitching skills has made a lot money that has never really paid off for any team he played for as is displayed by his 173-159 record.
Tomas Camacho was another pitcher that came out with a bonus of $17M. Like Espinosa, was never really all that exceptional as his 142-136 indicates.
Max Lima was signed for $15M. His catching skills was never great but at the plate he should have been a fore to reckon with. Although decent stats over the years was never spectacular.
Felipe Cabrera was signed by the Mets for $2.8M. Lacking skills at any level in all reality has become something of a minor league icon for the Mets. In his 14 seasons has amassed over 2,000 hits and 700 home runs.