delta0, you must be trolling. I and other and pointed out the gambler's fallacy and yet you continue to argue the point. Given you clearly didn't click the link I posted earlier I quoted it for you...
The gambler's fallacy, also known as the Monte Carlo fallacy or the fallacy of the maturity of chances, is the mistaken belief that if something happens more frequently than normal during some period, then it will happen less frequently in the future, or that if something happens less frequently than normal during some period, then it will happen more frequently in the future (presumably as a means of balancing nature). In situations where what is being observed is truly random (i.e. independent trials of a random process), this belief, though appealing to the human mind, is false. This fallacy can arise in many practical situations although it is most strongly associated with gambling where such mistakes are common among players.
In other words, flipping a coin 10 times in this sequence...
H-T-H-T-H-T-H-T-H-T
...has the exact same probability as flipping
H-H-H-H-H-H-H-H-H-H
..or any other sequence you can think of. You are no more likely to get '10 heads in a row' than '2 head in a row followed by 3 tails followed by another head then 2 more tails and finally 3 heads'.
When you've rolled your 9th head in a row, the coin has no brain so it doesn't think "wow 9 heads in a row, I better change my odds so it's more likely he gets tails next". On the 10th flip I have a 50% chance of getting a head on that flip (as I did on every flip previously).
A repetition of rare events BEFORE they occur does indeed necessitate multiplication which lowers the chance BEFORE it happens. What you are not getting is once that event has happened, then the chance of it happening again AT THAT POINT is the same and doesn't lower.
Therefore someone who has never done jury service is less likely to be called twice than once. However once they are called for it, the chance of them being called again AT THAT POINT IN TIME is the same as it was for being called the first time.
Conclusion, doing Jury service does not (assuming a random selection process) lessen your chances of being called again. You do not do it to "get it out of the way" as was implied by the OP.