Yep they do despite it seeming like an anachronism from the 1980s. I have a few car posters in my workshop because grown ups aren’t allowed to have them on their bedroom walls, at least according to my wife.

Seems like it. I regularly see photos of people's gaming setups/battlestations and hobby rooms, and it's not rare to see posters of cars.

Though it's more common to see smaller framed art, and model cars.