Not sure where "higher costs" come into play.
Not all "costs" are dollars paid out. There's a very common concept used in financial analysis and economics called opportunity cost.
From wiki:
The notion of opportunity cost plays a crucial part in ensuring that scarce resources are used efficiently. Thus, opportunity costs are not restricted to monetary or financial costs: the real cost of output forgone, lost time, pleasure or any other benefit that provides utility should also be considered opportunity costs.
The idea being - I agree to test Magic Bands. So I'm helping to test whether they work to get into the park, to open doors, to charge with and yes, whether the bands and the
MDE systems (online, app and/or kiosk) work for FP+.
I've got FP+ booked in the afternoon at Epcot. I'm at MK at rope drop to visit Fantasyland as usual without any FPs because I don't need FPs if I'm there at park opening. And then my bands don't work to get in. So I spend an hour with guest services trying to figure out why my magic bands didn't work.
I've just lost an hour of opportunity in Fantasyland. Peter Pan is now an hour wait instead of the 5 minute wait it would have been had I walked straight there at rope drop. So technically I've lost almost 2 total hours if I decide to wait in that stand by line.
How does Disney reimburse me for the opportunity cost to my ($4000?) vacation of testing their new technology for them and dealing with the issues that come up? They let me pull a regular FP for Peter Pan. I don't get my hour at guest services back, but I also don't have to stand in a 1 hour stand by line in addition to my hour at guest services.
Will some people have no issues and still get to pull regular FPs? Sure. Will some people have a ton of issues over their vacation that suck up hours of time they could have been at experiences? Possibly. I'm sure that's why the "double dipping" is being allowed during the testing phase of this new technology.