The population of the world rises all the time. In accordance with the population, naturally the production increases too. More people need more production and there are more people to produce. That is a big advantage, because now it is easier to find things of all prices. The important thing is not the ability to find cheap staff, but to find quality for a small amount of money.
It surely works for rugs too. As some countries like China have very big amount of manufacturing, there have been many cheap productions in the market. It would be useful too indeed, as you can use cheap rugs in places where you would regret to put an expensive one and where quality doesn’t matter. For example you can put across the door to home or to bathroom.
Cheap rugs can be used in offices too. As offices has much more guest than any home, it would be better to use a cheap rug rather than a new. Balconies and corridors are other options to use cheap rugs.
Looking for second hand will increase your chance to find cheap rugs. Even if they are cheap, they would make your home warmer and softer.