Although sales of Fitbit and other fitness trackers are strong, many of their owners lose enthusiasm for them once the novelty of knowing how many steps they've taken wears off.
Deepak Jayasimha's fitness tracker is now with his father-in-law in India, where it sits unused.
Annabel Kelly foisted hers off on the kids. Virginia Atkinson took hers off to charge the battery and hasn't picked it up since February.
Although sales of Fitbit and other fitness trackers are strong, many of their owners lose enthusiasm for them once the novelty of knowing how many steps they've taken wears off.
One research firm, Endeavour Partners, estimates that about a third of these trackers get abandoned after six months. A health care investment fund, Rock Health, says Fitbit's regulatory filings suggest that only half of Fitbit's nearly 20 million registered users were still active as of the first quarter of 2015.
"The question for investors is how long the market will continue to grow at this rate, and whether Fitbit can execute on growing engagement before ... the number of devices sold per year reaches saturation," Malay Gandhi, a managing director at Rock Health, wrote on a blog.
Abandonment affects all manufacturers of fitness trackers, which are relatively cheap at about $100 and are commonly given as gifts. Fitbit gets the spotlight because it started trading publicly last month and has 76% of the US market share by revenue, up from 64% a year earlier, according to the NPD Group.
Investors and analysts are bullish on Fitbit's prospects.
Its stock value has more than doubled since the initial public offering. Analyst William Power at Baird Equity Research said Fitbit had room to grow worldwide, as only a quarter of its revenue came from outside the US last year.
Power also wrote that Fitbits remain popular among employers and insurance companies looking for ways to keep people healthy. Fitbit is also profitable, earning $132 million last year on revenue of $745 million.
The company's market valuation of $8.6 billion is high compared with earnings so far, which could point to enormous growth potential -- or simply overvaluation.
Fitbit now has competition from Apple Watch and other smartwatches that do what fitness trackers do and more, such as showing news updates and boarding passes for flights.
If people aren't using their trackers, they won't recommend them to friends and family or upgrade when a new model comes out, said Dan Ledger, an analyst at Endeavour Partners.
They also won't pay for premium subscription packages, a potential growth area for Fitbit.
Fitbit had no immediate comment.
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