When a sportsbook lists the price for betting on a point-spread or other full-game wager at -105, then the bettor will be asked to lay $105 to win $100 (a $205 return on a win) or similar ratio on a given bet.
This price offering is nearly as inexpensive as it gets, generally, in sports betting.
Only a few select shops offer any price even slightly lower than this “discounted” margin, often referred to as a “dime-line” due to the .10 cent margin between the two offerings.
A sound-running, high-volume sportsbook can offer these player-friendly lines, particularly through online or app wagering, as a method to try and attract business, especially those from high-limit or high-volume.
Discounted lines are usually offered more frequently by online sportsbooks because of the limited amount of labor needed to process wagers.