It's the desperate refrain of a bunch of bookies spruiking the same product to you ...
In marketing, it's referred to as a #lossleader
They hope that you'll use their boosting-power-multiplier-thingo to increase your fixed odds by about 10% and then with a warm glow in your wallet, continue to bet with them for the rest of the day, week and month.
Just like the three pizzas for the price of two - you can't resist, even though the third pizza ends up in the freezer to be thrown out in a few months time when a new Third Pizza needs the room.