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You're talking about frequency and stuff but I believe it has nothing to do with that. It's most probably just RNG.
I disagree @Doondie the reason I post my jackpot is mostly so I don't forget when I have received it.
This has shown that every three to four weeks I get a jackpot. This shows that a random number generator isn't involved as rng's shouldn't deliver something with a discernible pattern.
Just like you I have noticed that the lollipop is always the last reward to be received from the Sweet Cinema, so that can't be down to 'chance' as you put it or a rng.
Similarly just last month there were loads of posts from people (including me) that had just won the jackpot from the Daily Treat Machine. Definitely not the workings of a RNG.
Ah well @Doondie as I am sure you know there is no such thing as a coincidence.
I agree it should be down to chance, but if it were down to pure chance we should all be getting more jackpots. Imagining that the Wheel was an eight-sided dice we should be winning a jackpot once in every eight spins. The fact that we don't, coupled with the fact that we don't receive any of the boosters on a one in eight basis means that some 'weight' must have been added to the Wheel.