The percentages aren't particularly relevant to me, because I live off advances, not royalties. Sales are still meaningful, because they help determine what advance I get next time, but in my case the idea that I'm getting a cut of each one is basically just symbolic – I've already been paid. Just one of many reasons I could never have had the same career without my "legacy" publisher.

(I should note that your percentages are way off, by the way – in the US I "get" 25% of the cover price for digital and between 7.5% and 25% for physical depending on the edition.)