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That might be 'most people' (i.e. the average pop music listener), but Radiohead still have a huge, huge fan following.

They've sold tens of millions of records, and nearly every album has gone platinum (I believe the last two were merely gold...).

I wonder if numbers like this are really a reliable indicator of what's going on. The world is big enough that you can be "niche" and still appeal to millions. I would also assume that fans of niche groups are more fanatical and supportive than fans of mainstream groups with broad appeal, which could equate to a much higher sales:fan ratio.

Just speculating, though.

No, at least in Europe "Fake Plastic Trees", "Just" and "Karma Police" were bigger than Creep. For most people their career ended with Kid A.

They headlined Coachella 2017

Not sure how this is relevant, "legacy" bands like Guns N Roses and ACDC headlined the previous 2 years and those bands have audiences that are shrinking to due to old age.

Ouch.