Hayes isn't overpaid, he's in the same area as JVR and Voracek, except as a center, he has extra value.
JVR is the best goal scorer, Voracek the best playmaker, Hayes the best in all situations (ES, PK, PP).
All have flaws, all don't use their size as effectively as they should, all have some defensive limitations.
AV leaned on Hayes in NY, and is leaning on JVR and Voracek here, because all three play better if pushed.
None are elite players, but all are solid top 6 guys (check their ES scoring) who aren't defensive liabilities.
All three are off to good starts and more than earning their contracts this year.