Well.. if it failed whilst carrying a load of SpaceX's own satellites, that would certainly be a loss to SpaceX.
Whether or not they are willing to take the risk, I guess only time will tell.
In 2016 and probably for most of 2017, the only SpaceX comms network would be 1 2 or 3 small sats that are part of development testing and would go up as secondary payloads. My bet is on SES being the first main payload on a reflown booster.
A more interesting question is when will a booster be reused. First half of '16 would be really great to see.
I have been thinking, the first time a used first stage will be reflown on a Falcon, there will probably be considerable concerns about the impact on mission reliability.
“Once reusable rockets come on line, we do plan on buying those,” said Blake.
“Our launch vehicle for SES-9 will be a recoverable vehicle,” Halliwell said. “We believe they will be able to recover it on this mission. We actually asked them: If we do recover it, can we use it again and get a good price discount? We’re still in discussions.”
The market is clearly treating used rockets as a different product that have to be explicitly purchased by customers. That means the existing queue of customers are in line for new rockets and folks who are putting down markers for used ones are essentially forming a new queue which gives them the potential to jump ahead in launch data which is a big incentive to accept what might be a riskier vehicle, much the same dynamic that caused people to go for SpaceX when it was new, schedule can be as important as price.
SES-8 was the first GTO flight of the Falcon 9 v1.1. They are sending SES-9 on the first v1.2 (and the first flight after a failure). They got good discounts for that and probably expect something similar in order to be the first to fly on a reused stage.