I mean obviously, racing drivers like Hamilton are in, well, real life, not a video game, there are much more "features" to do in real life compared to any video games. Like of course they can use any of their earnings for, anything they want, which includes collecting cars, but even then real life isn't only limited to cars for what to buy, unlike video games that are limited to what genre it covers. And for collecting cars, not only racing drivers do it, other type of wealthy people also do like other kind of athletes such as Mayweather or Ronaldo. Also, their car collections aren't necessarily a part of racing (I know people like that collects supercars but...), which is what racing game covers.
And for below, obviously not, people can be both (or even dislike both), having interest on either and also accept both. Just that in your case you seem to only tolerate something (like in GT), if it's motorsport-related, like the criteria of good track, or good reason for wanting a track to return is only if the track isn't "useless for racing", or that each GT events should all be based on something existed in real life motorsport, either fully or loosely, or that because rally cars aren't designed for normal circuit you forbid them to be used there even in game, You also call out on those that show an interest in non-motorsport aspect, like menus, car immersion feature like car wash, or wanting various type of cars to try (where GT, as an automotive appreciation, is all-encompassing, where car number is... needed).