This might help:
A scalper works with money lines. I associate scalpers more with baseball betting, because the standard dime line in baseball makes scalps more frequent than in most other sports. For instance, Arizona might open up -105 versus San Francisco, and a scalper might take Arizona, hoping that the baseball betting line goes up. If the line does go up to, say, -130, he can then take San Francisco at +120 on the other end and lock in a profit.
I saw this somewhere(cut + paste)
