I used to work in sports books, both Vegas and offshore.
Only time we ever placed +EV over balancing was on rare props with very low limits. Things like "Will either team score in the last 2 minutes of the first half?", or "Will either team score three straight times?" For years, squares took a small +price on the No, the sharps never bought back the Yes....but it they came Yes almost every single game.
(Folks finally noticed, and now that 2-min prop is about -400 instead of -180.)
We would never, never, never, even DREAM of doing something like that with the freaking point spread in the freaking Super Bowl....and I worked on the Las Vegas Strip at the 10th-biggest hotel in the world at the time, don't tell me it's because we were under-capitalized.