Nearly two-thirds of downloaders paid nothing for Radiohead's latest album, a survey has suggested.
Radiohead's previous albums include The Bends and Kid A
Fans were invited to put their own price on the 10 MP3 files that made up In Rainbows, from nothing to £100.
But internet monitoring company Comscore found that only 38% of downloaders willingly paid to do so.
The average price paid for the album was $6 (£2.90), the study - based on a survey of the online behaviour of over two million internet users - found.
American fans were the most generous, paying on average $8.05 (£3.85), compared with the $4.64 (£2.22) paid by those outside the US.
Of those who were willing to pay, the largest percentage (17%) paid less than $4 (£1.90). However 12% were willing to pay between $8-$12, (£3.80 - £5.71).
However industry experts said the report showed that only the most successful bands could afford to take such risks.
"Radiohead have been bankrolled by their former label for the last 15 years," said Michael Laskow, chief executive of Taxi, a company that helps bands get signed to record labels.
"They've built a fanbase in the millions with their label, and now they're able to cash in on that fan base with none of the income or profit going to the label this time around."
"How will new artists be able to use this model if they haven't built a fan base in the millions?" he added.
During the first 29 days of October, 1.2 million people worldwide visited the In Rainbows site, but no official figures have been released on how many downloads were made.
Radiohead recently signed a deal to give In Rainbows a physical release in shops, although no date has yet been announced.