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The way I interpret the payment for a dual version of XP10 and XP11 is that you are placing an order or expression of interest for XP11 and LR are providing a copy of XP10 to those flight simmers wanting to move into XP immediately.
Like XP10 I would expect that upgrades for XP11 would be free as and when they are released.
I am also of the opinion the flight simmers who changed from XP9 to XP10 had to pay for the upgrade.
For those flight simmers who were and still remain dedicated to the microsoft pakages had to purchase the newer versions from say FS2000 to FS2002 to FS2004 and finally to FSX. I know I did. I acquired the packages when they were replaced with the newer version or two.
If still not convinced have a look at the following link http://questions.x-plane.com/4169/why-should-i-pay-for-x-plane-11
This may help.
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