Dodgers are paying from excess though. They don't need Verdugo or Maeda. They have the depth at both positions. They also didn't trade any of their prospects, who they could use to acquire other players. They may also already be prepared to beat anyone's offer to Betts this winter, whether it's good value or not. If they don't, there are other players on the market who they could sign. It's not like they're screwed if Betts leaves.
As for Price, 3 years x $15 million is probably, at worst, net value, given what other starters have signed for this year. Per Fangraphs $/WAR, Price has averaged $21.25 per year with the Red Sox, and his worst year was $11.7 in 2017. Every other year he's provided at least $18.8 of value to the Red Sox.
It's not as simple as trading five years of one player for one year of another. If they were going all in for this year, that would be one thing, but trading for Betts does not affect their ability to compete in the future at all. That seems pretty low risk to me.
really depends what Verdugo becomes Imo