Strategically, the President's Team seems to be spending cash in states considered close, such as Texas or Arizona. The President's Team believes that winning NYS is not a practical possibility. (A subject for another posting.)
Candidly, lawn signs do not vote. I do not believe that a lawn sign contributes much to a candidate's victory. Putting up a lawn sign makes the average person "feel" good, that they are involved in a campaign, but it's mostly illusion, in my opinion.
A strong sign campaign can boost a local candidate, notably if the candidate has lower name recognition. If a candidate has stronger name recognition, signs are unnecessary.
For those who may be interested, a single lawn sign can cost anywhere between two to seven dollars each, depending on size, color, its construction and delivery/printing urgency.