There is a huge difference between Maylasian driftwood and that anonymous driftwood that you find locally. Maylasian Driftwood is found in the river banks of the tropical rainforests near the equator. The same place where alot of are tropical fish come from. This driftwood is very dense, sinks like a rock, has been dead in submerged water for years, and won't rot quickly. It has a beautiful dark color and the wood grain shines when showcased in an aquarium. There is a great reason why this type of wood is so popular and why people like myself have shelled out hundreds of dollars for it. Simply put, it's the best.
Most anonymous driftwood found locally is soft and won't sink. Since it's from here, a cold climate region, it's not natural for it to be in a tropical fish tank. This wood probably hasn't ever been submerged in water. It might even decompose quickly when submerged in warm aquarium water. It also has a very dull grayish color. I don't think anybody would pay big dollars for this type of wood because it's not nearly the same as Maylasian drifwood.