Not only did they launch these, but they have another 2 launches UNTIL the Falcon Heavy. 
Assuming that it works, then SX is really in-line for making space access dirt cheap. 
As it is, the FH has a second stage that will attempt to land back on a ship. Assuming that SX is able to complete that part, then every single launch with full re-usable going forward will cost them less than $10M even when launching 40 tonnes into orbit. And with them charging about 70M for launching 40 tonnes, they will make a KILLING and be able to fund BFR/BFS.