how many GDP is wasted on GRE / TOEFL?

Recently, I found that it really really hard to find a open sit for GRE / TOEFL test.

the new three month TOEFL schedule was published yesterday, and it's already full last night. You can't tell how many people are waiting for the registration, and how many can't find a sit.

That's why New East get the huge market for preparing the test.

But...how many time have been spent (or wasted?) on these English test? how many GDP spend on it? and how much we can produce if we don't do such things.