Above was the graphic which showed the Spacex BFR at lower cost than the Falcon 1.
In 2005 Falcon 1 was advertised as costing $5.9 million ($7.3 million when adjusted for inflation in 2015). In 2006 until 2007 the quoted price of the rocket when operational was $6.7 million. In late 2009 SpaceX announced new prices for the Falcon 1 and 1e at $7 million and $8.5 million respectively, with small discounts available for multi-launch contracts.
This would mean at $7 million the Spacex BFR launch 150 tons would have less than a $50 per pound launch cost.
The Spacex BFR only has two large pieces. It has a first stage and the top ship. Both parts will be re-used. Spacex has shown it can land the first stage. Landing the the large top section of the BFR safely is in the design with two redundant rockets to ensure highly reliable landing.
I believe Spacex will succeed with full reusability and with low maintenance and recovery costs with the BFR.