It will be interesting to watch.
He spent less than most of his primary opponents--and won  the nomination.
He spent a lot less than Clinton did--and won the election. 
If he can pull out the miracle of expanding the economy, rebuilding the military, a major infrastructure initiative and cutting the red ink in Washington I will be surprised and happy. 
I am willing to give him a couple of years to prove it can be done.  2018 will be an election in which Trump's success, or lack of it, will be the campaign focus.