The purpose of the post was to open minds to what many believe is a write off. Once you're prepared to explore the possibilities and create systems to suit, Laying longshots can be very profitable. We run 26 Lay systems tailored for race field sizes and classes of races. No bots involved but the selections are software generated for initial consideration and then a series of visual cross checks to oncourse fluctuations, previous encounters, speed map etc, before committing to a bet.

The average number of bets per day is 35, 99.7% SR, 0.73% POT and Max Bank Risk 1.5%. Only bet to Liability 1% of Bank.

Of course you're right CP, again a broad brush example only. You can't win at Lay betting with something so over simplified.
The only limitation is the amount you can Lay without grossly affecting the Lay price. Weekdays we use $2k liability.