It certainly works, you're just not the target demographic, which happens to be "easily swayed".
Yeah okay, that's pretty fucking spiteful. Advertising works on a "Hierarchy of effects model" which is as follows:
It undeniably works to the first two steps on everyone. Liking, well that's up to the competency of the advertiser, and the previous exposure to the product by the consumer. Thing is, you can't suddenly make someone want something. You have to capitalize on previously existing demand; if someone doesn't want a mattress or a rug, then an advertisement isn't going to change their minds.
Children already want toys, badly, so that's why toy advertising "works so well" on them. I don't know who the fuck wants a Snuggie, but there's obviously a market for that too.
Just because you've never seen an advertisement that's swayed you does not mean you're some fucking kind of special snowflake, a sentient human being with their eyes open in a horde of sheeple. Just means that they're not selling anything that appeals to you.