Not sure whether passing on Rocker was a good move, a bad move, or an ugly move. But I am certain it was NOT a Wilponian move. It was a baseball decision, not a financial decision. Based on their review of Rocker's meds, the Mets decided that they preferred having the 11th pick in 2022 to having Rocker in 2021.
It's not like they tried to sign Rocker on the cheap, as you imply. They flat-out pulled their offer.
By the way, I believe MLB changed its draft rule to prohibit a team doing what the Mets did with Rocker. I forget the specific terms, but it's something like if you draft someone in the first round, you MUST offer him at least 80% of slot value. Let the buyer beware.