after about 40,000 miles the intake will pay for itself, just by not having to buy a new OEM filter each time you need a new filter (going by 10k change intervals)
Where are you getting these change intervals? First you say every oil change and now you bumped it up to 10k. There are people that have gone many many many more miles without the filter needing to be changed. If those changes were realistic for the majority of the truck driving population(there are some that need those frequent change due to environment that they live in, but they are by no means the mainstream) then you might have something, but I can count on one hand the amount of people that drive their trucks in areas that call for that kind of changes and that's less then 5% of the psd owners that I know. Plus if the stock filters were that crappy and needed to be changed that often, then I probably be driving a different truck as well.
To the OP: what is your reason for changing out the filter? Use of changing and/or reusing the filter? Filtration or more air flow?
The first one is about the only one that has any merit to it, but it would not be worth it to me just for that alone.
Filtration of the stock filter is pretty damn good, this isn't the same filter that was on the 7.3.
Air flow, while most a/m intakes do flow more then stock, they do not flow more air until you hit very high in the rpms(the quickest is at 3,700 rpm) well beyond the rpm ranges for tq/hp of a stock or tuned 6.0(2,000 and 3,300 rpm repectively).
In my opinion, unless you're going to be doing heavy modding, you really do not gain much(if anything at all) with changing out the intake.