Mostly by not spending money frivolously.

The house I live in was advertised when it was on sale, all the food at the store gets advertised, all the non-bespoke clothes I can buy get advertised, as do most of the bespoke ones, every car gets advertised...

The difference is whether those ads were exposed to you before you bought it. Was it a factor in your decision?

Not whether it's something in the world that's ever been marketed at all, because literally everything has.

Generally yes. Especially the grocery store is constantly advertising hundreds of items, and I've looked at their ad pages more than once. And it's pretty hard to find houses outside of advertising platforms, and I used to watch enough TV that I'd seen ads for every clothing store and every car before I had a chance to find them on my own.