Perhaps, but money only goes so far. Hillary spent like over $1 billion and it only bought her 20 states. Texas is huge, but it has more down-ballot races than I can count. Ohio has the state Supreme Court on the line and potentially some down-ballot races, not to mention Trump apparently views the state as the absolute most important to his victory in November. Iowa has a lot, but it's also much cheaper and extreme spending only goes so far.
Ok but you just can't spend heavily in every single state. We can't go pedal to the metal in MI, WI, PA, NC, FL, AZ, GA, TX, OH, IA, NH, ME, and NV. Much easier to talk about large investments than to argue where to cut.