Boxster to be Top Dog.

[Perfectlap]

Yes the tin top is more expensive but the Cayman does have more horsepower (to reduce the higher center of gravity penalty vs. the Boxster). If they were sold with equal power the Boxster would be quicker and that would inconvenience Porsche's forced hierarchy which they use to market the Cayman as a "stepping stone" Porsche.
But the reality is that the Boxster and Cayman are the same car, simply variants. That they have different names and the 911 and 911 Cab do not, makes this obvious marketing spin.
And although the Boxster may be priced higher going forward that doesn't mean Porsche won't make sure that the 981 getting the GT4 treatment will only be the Cayman. It seems to me like Porsche fear the mid engine car with the lowest center of gravity and lightest weight.