I can understand the Kirby Pucket approach, that is, turning down the extra million or so available elsewhere to get yourself into a situation where your total life experience is more enjoyable.
But everything has its price. you'd have to be an idiot to take $10m if $27m were on the table. For one thing, for all you know the $10m team would trade you next week to the team that had been willing to pay you the $27m. (Better get that no-trade clause in there.)
Few players ever get even one shot at free agent money. For those who do, you can't blame them for cashing in on the fruits of their years of labor. Not one of us would handle it differently if it were our (or our son's) money. It's easy to sit on a web site and claim otherwise, but who's kidding whom?