dirtyP, just.....just stop.
You're making up numbers and trying to compare halo to starcraft, presumably, because 360 is the greatest console of all time (AMIRITE?).
Starcraft 2 will go down to 19.99 if a company is stupid enough to take a loss on a product that will sell for double that.
This is how it has always worked for blizzard game series.
The first game comes out. Stays at full price for 6 months . Then it goes down to like 45 and stays there for a while,. at most, dropping to 39.99.
Then the expansion comes out priced at 40$ and a bundle with a guide releases for 65-70$. Over the next year the bundle comes down to 50, and both games go down to 30$.
There it stays for a while. There might be some special sales, but the price hovers around 30$. Then the second expansion comes out. The original goes down to 20 $, and the first exp sells for 20$ and the second expansion sells for 40. The bundle sells for 40. They then release something like a "warchest" with both expansions, the game, and an artbook and strategy guide, maybe 2. That sells for 70 $
You do realize that starcraft 1 with the expansion is STILL 19.99$ right? After 10 years.