I am in agreement for most of the reasons Keewart posted on why sign this year and not next as a senior. Seniors don't get much for signing even in a normal draft anyway.
I think this is a personal decision. I am sure that most of these players already had discussions with their coach.
What I don't understand is why a HS grad would take this offer.
I do know of one that turned down 500k in the draft and another who decommitted to a 4 year and going to JUCO next year.
JMO