Why would I want to learn about new services or products?
Or more directly to the point, why would I want to let /you/ decide which services and products I learn about, when, where, and how often?
When that is a) more in your interest than mine, and b) inevitably going to turn into a "cover every surface and channel into advertising as you try to shout loudest for my attention in competition with every other vendor of every product and service in the world".
>Why would I want to learn about new services or products?
I think you missed the context of gp's comment. His example of ads was from a hobby enthusiast's magazine such as Model Railroader.[1]
Many readers buy hobby magazines in part for the ads. Yes, there are feature stories but the ads themselves are also informative of new products the readers want to learn about.
So to directly answer your question of "why would I want to learn about new services or products?" -- it's because that desire for ads was implicit in your decision to buy a hobby-oriented magazine. (The "I" and "you" is not you specifically but a rhetorical placeholder for the generalized magazine buyer.)
Another example of some people expressing a desire for ads is buying the Sunday edition of their local newspaper. (Many readers won't buy the Monday-to-Saturday editions but they'll go out of their way to buy the Sunday copy that's has the ad inserts.) They didn't buy it for the news articles written by journalists; they bought it for the stores' ads to see what's on sale and for the coupons.
An opposite example of buying a magazine because it does not have ads would be something like Consumer Reports.
Or more directly to the point, why would I want to let /you/ decide which services and products I learn about, when, where, and how often? When that is a) more in your interest than mine, and b) inevitably going to turn into a "cover every surface and channel into advertising as you try to shout loudest for my attention in competition with every other vendor of every product and service in the world".