Because you, a paying customer, are worth the most to the advertisers.
It is also worth noting that there is plenty of advertising in Apple products. Heck, the last time I used one they had at least two digital storefronts built in. They may not be as crass as Microsoft is (e.g. with the use of the Start Menu), but it is data driven. Whether the advertising is plastered everywhere or not simply reflects the target market, rather than how they collect and use data.
Yes, you are promoting Apple products if you carry around a Macbook with its logo, but you aren't being advertized to. The built-in stores might just barely meet the definition, but it is very different from a random ad during a TV show or on your desktop.
The have publicly discussed their plans to monetize that data.
That's not what the previous commenter was talking about at all.
Some platforms and services have been selling "no ads" as a feature. Say Apple or YouTube Premium or 100s of 1000s of applications on Android. This does not mean they'll never open up to ads in the future. Maybe a future "premium value" will just be "fewer ads". And when they do, they're more likely to generate sales because they're customers who are already paying for premium services.
The argument says "the more you spend the more you are worth to advertisers, thus eventually you will see ads". It doesn't add, "there are some categories of products for which ads aren't tolerated but for all the others this holds"
There's more than enough examples anyway where cheaper options have ads and more expensive ones don't, like airplanes or restaurants and bars.
[1] https://www.windowscentral.com/how-remove-advertising-window...
