He took the time to answer a lot of charges that were made in about 10-20 million dollars worth of negative ad buys by his competitors too. And it cost him nothing, because once again the networks gave him free air time.
Trump is a virtual reality star. Virtual reality stars have one product: themselves. They attract attention professionally. Kim Kardasian takes pictures of her butt and she cashes 10 million dollar checks. Trump just put on a press conference with wine and steaks, and for the next week that's all everyone will talk about. Romney who?
You're right and that's ALL he's got going for him, the media coverage. Once the general campaign starts, the media would put Trump on media blackout and turn into 24/7 Hillary infomercials. Amazing you would base your electoral success on trusting the media to deliver it for you with free air time. IT AIN'T GONNA HAPPEN!