Because they're not 30th place, and in fact are competing for a playoff spot today? Why do I have to explain that?
The hope would be you sign him. He's exactly what we need in a shutdown center- not RNH.
How often do teams completely blow up their team 20 games into a season to initiate a playoff push? Seems kind of silly doesn't it?
Let's run the scenario where the offense continues to struggle (considering you just traded our second-leading scorer) and they miss the playoffs. Then July 1st rolls around and Martin Hanzal goes to market because he's a 30 year old 6'6 center and has zero interest being a third line center for the rest of his career.
Now we've moved two of our most valuable 20-something forwards for an ageing 32-year-old defenseman signed until 2022 (what some would call a cap-dump), a 36 year old winger who may or may not retire at years end, a 3 million dollar fourth liner who makes Tyler Pitlick redundant (also a UFA) and a prospect* that has a development path worse than Reinhart's.
*actually like him but would buy low on him.
Teams trade future pieces for rentals, not key players.