That is perhaps the least persuasive argument I have ever seen presented against imposition of a jail sentence.
C'mon, jail costs? I will concede that it is a novel approach for a convict to argue that he should be spared jail time because incarceration will cause the state to incur the expense but said out loud in open court would risk additional time for assault (you never want to assault the intelligence of the person deciding your fate). Jail space overcrowding? Mention that in an effort to get off the hook and the Judge will find a cell even if it means a bank thief would need to be released early.
In addition, in this case the supposed loss of income tax revenue, if any, bears no relation to sentencing and whether or not Williams is ordered to jail. Williams' income is earned and distributed according to his employment agreement with the University. NU will continue to pay his salary (or a portion thereof if they determine disciplinary measures apply) as the administration, not the Judge, deems legally permissible and appropriate under his contract.