It's presented as a promotion uncertain to happen ...
... but what's the likelihood of 100 runs?
It's almost a sure thing.
All teams play today. The average team is scoring 4.35 runs per game this year. Multiply that by 30 and you have roughly 130 runs. Then factor in one doubleheader today.
By comparison, there were 110 runs scored yesterday. There were exactly 100 runs scored last Thursday, and only 22 teams were in action. The last I saw a day come close was July 15 when there were 101 runs on a full day featuring dudes like Verlander, Cain, Sale, Strasburg and Hamels. Unless a giant rainstorm suddenly consumes the country, basically you're getting a half-off pizza coupon and you're going to like it.