"They've done a good job taking cost out this year, but content costs will increase from here and the competition just gets stronger," Josh Wilson, senior portfolio manager at NZ Funds, said.
"Today's result doesn't change the long-term prognosis for the business, which is pretty challenged," Wilson said.
Subscriber numbers for the year came to 767,727 - down from 824,782 in the previous year and 11,049 fewer than in December.
Hollingworth said about $20m in savings had come from lower programming costs.
In addition, Sky TV did not have to contend with the same level of expenses incurred in the previous year, which included costs of covering the America's Cup, the Summer Olympics and the Lions tour.
Sky TV is sensitive to the New Zealand dollar because its biggest cost - TV programming - is paid for in US dollars.
Hollingworth said the company was insulated from the Kiwi's current weakness as its hedging policy had Sky TV covered at US71c for the next 18 months - compared to today's spot rate of US66.3c.
Sky TV will pay a 7.5 cents a share final dividend, taking the annual dividend to 15 cents, down from 27.5 cents in the previous year.
Hollingworth said the satellite business was continuing to decline slowly as customers continued to continued to leave that platform.
"But we are trying to offset that by creating user products for a younger, different, demographic," he said.
Chief executive John Fellet, who is set to leave the job later this year, said Sky was building a strong suite of online products to meet the needs of all New Zealanders.
The goodwill writedown arose from the merger of Independent Newspapers and SKY in 2005, and reflected the difference between the fair value of SKY's assets at the time and the price that INL shareholders agreed to exchange their shares in INL for SKY shares.
The impairment is a non-cash charge that has no impact on Sky's 2018 cash flows or banking covenants, Fellet said.
Fellet said that 768,000 customers still chose to pay for Sky's services. "By global standards, 40 per cent market penetration for a Pay TV service is significant," he said.
Last year, Sky attempted to merge with Vodafone New Zealand but the deal was rejected by the Commerce Commission.
Sky TV's shares last traded at $2.57, down 8 cents.