Betting with the steam can be advantageous when you identify a legitimate source of sharp action that appears to be driven by insider information or significant analysis, as this can signal a strong likelihood of an outcome and offer value despite the line movement. Conversely, betting against the steam may be prudent when the line has moved dramatically in one direction due to public perception rather than substantial information changes, indicating that the new line might overstate the true probability of an outcome, thus offering value on the opposite side.