What's the catch with sub-$100 8x10 area rugs?

The honest tradeoff repeated across mainstream reviewers and specialist subreddits: thinness. They look great in photos and clean well, but they feel more like a heavy printed mat than a traditional rug. Designers on r/femalelivingspace specifically flag polypropylene/polyester rugs as 'stiff' compared to wool, even when they tolerate high traffic better.