Because it unlikely they do anything worthwhile via trades( 5 mil below threshold) to improve the team significantly enough to make noise in the playoffs if they somehow do pass up the Brewers and Reds ( who could add)..
Then what, especially if they dont bring Bellinger and Stroman back.
Most of these players on current rosters will be gone within the next 1-3 seasons, so wouldn't it be better if they sold who they can for younger ready/near ready talent then to stay pat besides adding what will likely be a couple of rentals just to try and win a weak division?
For the record, I hope they keep and extend Bellinger, and yes it would be great to see them win the division but I just feel it wouldn't be worth the ride if they lose guys and have nothing or nothing much in return