Did they mention a price?
said $14.99 for both in the Twitch video. If they are offered individually as well I'm assuming they may get some sales of Big Buck Hunter by itself, can't see a rush to buy Whoa Nellie! individually, but can now see where the melon balls came from. Suppose Stern must have found a demand for a Whoa Nellie! (real rather than virtual) type of table or they wouldn't have made it - lowest scoring game this century? Console release shortly after the Steam release on 7th September.
If it were an EM that came out in that time period, it would've been considered run-of-the-mill at best.