Sky TV chief executive John Fellet told analysts its recent move into the internet TV market was a positive step, not a defensive one.
Fellet said he did not see internet TV as a new mainstream for pay TV and pointed to the resilience of standard linear pay TV in the US market.
In San Jose - in the centre of Silicon Valley - where there were all manner of new media pay technologies, 95 per cent of viewing was still through traditional pay TV, he said.
Fellet said competition for internet TV on demand was a small part of the pay TV market. Sky's own service was aimed at a wider market than just existing subscribers and will be running by the end of the year.
Moutter did not want to speculate on when Lightbox - on which Spark has spent $20 million to date - would break even.
"We are launching a new venture, we don't know what customer appetite will be like and we're going to have to feel our way as we go," he said.
However, Moutter said if the service was "very successful", Spark could put more money and effort into it. "If we get a really strong uptake, we'll increase our efforts not just sit on our coat-tails," he said.
Meanwhile, Spark reported a net profit of $458 million, up 94.1 per cent for the 12 months to June 30, when taking into account AAPT, the telco business it sold in Australia this year. It has targeted the mobile market as a key area for future profits.