Here is a visual f just what I am talking about:
The last play in this system occurred on 9/2 and the bet was on Minnesota archived in the database at -120. The game opened at -120 (so I assume, at least in this case, it was logged within the database as the opening line).
The game had a closing line from -126 to -130, so certainly the best line was available at opening, and worsened by the time it was bet by the system user, perhaps as bad as -130. That is an 8.3% line change, being wagered into a system that has a 1.4% ROI. Do you see how quickly that can bankrupt you? Now you know why I have a 10% rule!