Garbage is a raw material just the same way as a tree or crude oil.
Crude oil is a usless product in its natural state. however after undergoing "sorting" it has a vartiety of uses.
How much does it cost to get crude out of the ground, refined, manufactured into plastic bags or shampoo bottles.
Trees are certainly not rubbish however only 42% (approx) of a tree is turned into timber. The rest is either left in the bush or chipped. Once again this could be seen as "sorting"
Then there is transport, crude and it derivitves are transported via pipeline, supertanker, road rail and every other means millions of miles to get to you.
Garbage is a raw material on your doorstep and requires very little transport by comparison.
Valuable products can be created from garbage.
It is up to us to recognise the value of rubbish/recycled materials as a RAW MATERIAL and manufacture products in economic proportions from this raw material. This requires that the product should have a perceived cost/benefit ratio, that it satisfies a need or performs a service.
The cost of curbside recycling will come down as more people recognise the value of products manufactured from garbage.